diff --git a/frontend/src/pages/qna/QnADetailPage.js b/frontend/src/pages/qna/QnADetailPage.js
index 52d2e1e..bb93229 100644
--- a/frontend/src/pages/qna/QnADetailPage.js
+++ b/frontend/src/pages/qna/QnADetailPage.js
@@ -2,7 +2,7 @@ import '../../assets/styles/global.css';
 import { useState, useEffect, useRef, useCallback } from 'react';
 import { useParams, useNavigate } from 'react-router-dom';
 import styles from './QnADetailPage.module.css';
-import { FiMoreVertical, FiCornerDownRight, FiChevronLeft } from 'react-icons/fi';
+import { FiMoreVertical, FiCornerDownRight, FiChevronLeft, FiChevronRight, FiX } from 'react-icons/fi';
 import {
     CommentImoji,
     MeCuriousToo,
@@ -97,6 +97,60 @@ function QnADetailPage() {
     const [editingCommentId, setEditingCommentId] = useState(null);
     const [editCommentText, setEditCommentText] = useState('');
 
+    // ── 이미지 확대보기(라이트박스) 상태 ─────────────
+    // images: 같은 묶음(질문 또는 한 댓글)의 이미지 url 배열, index: 현재 보고 있는 인덱스
+    const [lightbox, setLightbox] = useState(null);
+
+    const openLightbox = (images, index) => setLightbox({ images, index });
+    const closeLightbox = () => setLightbox(null);
+
+    const showPrevImage = useCallback(() => {
+        setLightbox(prev => {
+            if (!prev) return prev;
+            const nextIndex = (prev.index - 1 + prev.images.length) % prev.images.length;
+            return { ...prev, index: nextIndex };
+        });
+    }, []);
+
+    const showNextImage = useCallback(() => {
+        setLightbox(prev => {
+            if (!prev) return prev;
+            const nextIndex = (prev.index + 1) % prev.images.length;
+            return { ...prev, index: nextIndex };
+        });
+    }, []);
+
+    useEffect(() => {
+        if (!lightbox) return undefined;
+
+        const handleKeyDown = (e) => {
+            if (e.key === 'Escape') closeLightbox();
+            if (e.key === 'ArrowLeft') showPrevImage();
+            if (e.key === 'ArrowRight') showNextImage();
+        };
+        document.addEventListener('keydown', handleKeyDown);
+        return () => document.removeEventListener('keydown', handleKeyDown);
+    }, [lightbox, showPrevImage, showNextImage]);
+
+    // 모바일 좌우 스와이프로 이미지 넘기기
+    const touchStartXRef = useRef(null);
+
+    const handleLightboxTouchStart = (e) => {
+        touchStartXRef.current = e.touches[0].clientX;
+    };
+
+    const handleLightboxTouchEnd = (e) => {
+        if (touchStartXRef.current === null) return;
+        const deltaX = e.changedTouches[0].clientX - touchStartXRef.current;
+        const SWIPE_THRESHOLD = 50;
+        if (deltaX > SWIPE_THRESHOLD) {
+            showPrevImage();
+        } else if (deltaX < -SWIPE_THRESHOLD) {
+            showNextImage();
+        }
+        touchStartXRef.current = null;
+    };
+
 
     const fetchQuestion = useCallback(async ({ showLoading = false } = {}) => {
         try {
@@ -446,7 +500,13 @@ function QnADetailPage() {
                 {comment.imageUrls?.length > 0 && (
                     <div className={styles.commentImages}>
                         {comment.imageUrls.map((url, idx) => (
-                            <img key={idx} src={url} alt={`댓글 첨부 이미지 ${idx + 1}`} className={styles.commentImage} />
+                            <img
+                                key={idx}
+                                src={url}
+                                alt={`댓글 첨부 이미지 ${idx + 1}`}
+                                className={styles.commentImage}
+                                onClick={() => openLightbox(comment.imageUrls, idx)}
+                            />
                         ))}
                     </div>
                 )}
@@ -544,7 +604,13 @@ function QnADetailPage() {
             {question.imageUrls?.length > 0 && (
                 <div className={styles.questionImages}>
                     {question.imageUrls.map((url, idx) => (
-                        <img key={idx} src={url} alt={`첨부 이미지 ${idx + 1}`} className={styles.questionImage} />
+                        <img
+                            key={idx}
+                            src={url}
+                            alt={`첨부 이미지 ${idx + 1}`}
+                            className={styles.questionImage}
+                            onClick={() => openLightbox(question.imageUrls, idx)}
+                        />
                     ))}
                 </div>
             )}
@@ -622,8 +688,59 @@ function QnADetailPage() {
                     </button>
                 </div>
             </div>
+
+            {/* ── 이미지 확대보기 ── */}
+            {lightbox && (
+                <div
+                    className={styles.lightboxOverlay}
+                    onClick={closeLightbox}
+                    onTouchStart={handleLightboxTouchStart}
+                    onTouchEnd={handleLightboxTouchEnd}
+                >
+                    <button
+                        className={styles.lightboxCloseBtn}
+                        onClick={closeLightbox}
+                        aria-label="닫기"
+                    >
+                        <FiX size={28} />
+                    </button>
+
+                    {lightbox.images.length > 1 && (
+                        <button
+                            className={styles.lightboxPrevBtn}
+                            onClick={(e) => { e.stopPropagation(); showPrevImage(); }}
+                            aria-label="이전 이미지"
+                        >
+                            <FiChevronLeft size={28} />
+                        </button>
+                    )}
+
+                    <img
+                        src={lightbox.images[lightbox.index]}
+                        alt={`확대 이미지 ${lightbox.index + 1}`}
+                        className={styles.lightboxImage}
+                        onClick={(e) => e.stopPropagation()}
+                    />
+
+                    {lightbox.images.length > 1 && (
+                        <button
+                            className={styles.lightboxNextBtn}
+                            onClick={(e) => { e.stopPropagation(); showNextImage(); }}
+                            aria-label="다음 이미지"
+                        >
+                            <FiChevronRight size={28} />
+                        </button>
+                    )}
+
+                    {lightbox.images.length > 1 && (
+                        <div className={styles.lightboxCounter}>
+                            {lightbox.index + 1} / {lightbox.images.length}
+                        </div>
+                    )}
+                </div>
+            )}
         </div>
     );
 }
 
-export default QnADetailPage;
+export default QnADetailPage;
\ No newline at end of file
diff --git a/frontend/src/pages/qna/QnADetailPage.module.css b/frontend/src/pages/qna/QnADetailPage.module.css
index c1e4091..83616c3 100644
--- a/frontend/src/pages/qna/QnADetailPage.module.css
+++ b/frontend/src/pages/qna/QnADetailPage.module.css
@@ -244,12 +244,29 @@
 }
 
 /* ── 질문 첨부 이미지 ── */
+.questionImages {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 10px;
+    margin-bottom: 18px;
+}
+
 .questionImage {
     width: 100%;
     border-radius: 12px;
     object-fit: cover;
     display: block;
-    margin-bottom: 18px;
+    cursor: zoom-in;
+    transition: opacity 0.15s, transform 0.15s;
+}
+
+.questionImage:hover {
+    opacity: 0.92;
+}
+
+/* 이미지가 여러 장일 때는 한 줄에 나눠 배치 (간격은 위 gap 속성으로 처리) */
+.questionImages:has(.questionImage:nth-child(2)) .questionImage {
+    width: calc(50% - 5px);
 }
 
 /* ── 액션 버튼 행 (좋아요 / 댓글달기) ── */
@@ -419,12 +436,30 @@
     margin-top: 2px;
 }
 
+.commentImages {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+}
+
 .commentImage {
     width: 100%;
     max-width: 380px;
     border-radius: 8px;
     object-fit: cover;
     display: block;
+    cursor: zoom-in;
+    transition: opacity 0.15s;
+}
+
+.commentImage:hover {
+    opacity: 0.92;
+}
+
+/* 댓글에 이미지가 여러 장일 때는 한 줄에 나눠 배치 */
+.commentImages:has(.commentImage:nth-child(2)) .commentImage {
+    width: calc(50% - 4px);
+    max-width: calc(50% - 4px);
 }
 
 .commentDate {
@@ -550,6 +585,12 @@
 }
 
 /* ── 이미지 미리보기 ── */
+.imagePreviewList {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+}
+
 .imagePreviewWrapper {
     position: relative;
     display: inline-block;
@@ -558,6 +599,14 @@
     align-self: flex-start;
 }
 
+.imagePreviewList .imagePreviewWrapper {
+    margin: 4px 0 0 0;
+}
+
+.imagePreviewList .imagePreviewWrapper:first-child {
+    margin-left: 12px;
+}
+
 .imagePreview {
     width: 80px;
     height: 80px;
@@ -583,6 +632,109 @@
     z-index: 101;
 }
 
+/* ── 이미지 확대보기(라이트박스) ── */
+.lightboxOverlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.85);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 1000;
+    padding: 40px;
+    box-sizing: border-box;
+    cursor: zoom-out;
+    animation: lightboxFadeIn 0.15s ease-out;
+}
+
+@keyframes lightboxFadeIn {
+    from {
+        opacity: 0;
+    }
+
+    to {
+        opacity: 1;
+    }
+}
+
+.lightboxImage {
+    max-width: 100%;
+    max-height: 100%;
+    object-fit: contain;
+    border-radius: 8px;
+    cursor: default;
+    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
+}
+
+.lightboxCloseBtn {
+    position: fixed;
+    top: 24px;
+    right: 24px;
+    width: 44px;
+    height: 44px;
+    border-radius: 50%;
+    background: rgba(255, 255, 255, 0.15);
+    border: none;
+    color: var(--white);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    z-index: 1001;
+    transition: background 0.15s;
+}
+
+.lightboxCloseBtn:hover {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+.lightboxPrevBtn,
+.lightboxNextBtn {
+    position: fixed;
+    top: 50%;
+    transform: translateY(-50%);
+    width: 48px;
+    height: 48px;
+    border-radius: 50%;
+    background: rgba(255, 255, 255, 0.15);
+    border: none;
+    color: var(--white);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    z-index: 1001;
+    transition: background 0.15s;
+}
+
+.lightboxPrevBtn:hover,
+.lightboxNextBtn:hover {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+.lightboxPrevBtn {
+    left: 24px;
+}
+
+.lightboxNextBtn {
+    right: 24px;
+}
+
+.lightboxCounter {
+    position: fixed;
+    bottom: 28px;
+    left: 50%;
+    transform: translateX(-50%);
+    background: rgba(255, 255, 255, 0.15);
+    color: var(--white);
+    font-family: var(--font-main);
+    font-size: 13px;
+    font-weight: 500;
+    padding: 5px 14px;
+    border-radius: 20px;
+    z-index: 1001;
+}
+
 /* ════════════════════════════════════════
    반응형 — 태블릿 (768px 이하)
 ════════════════════════════════════════ */
@@ -682,8 +834,9 @@
         font-size: 13px;
     }
 
-    .commentImage {
-        max-width: 100%;
+    .commentImages:has(.commentImage:nth-child(2)) .commentImage {
+        width: calc(50% - 4px);
+        max-width: calc(50% - 4px);
     }
 
     /* ── 댓글 수정 ── */
@@ -701,4 +854,35 @@
         bottom: 12px;
         padding: 6px 10px;
     }
-}
+
+    /* ── 라이트박스 ── */
+    .lightboxOverlay {
+        padding: 16px;
+    }
+
+    .lightboxCloseBtn {
+        top: 12px;
+        right: 12px;
+        width: 38px;
+        height: 38px;
+    }
+
+    .lightboxPrevBtn,
+    .lightboxNextBtn {
+        width: 38px;
+        height: 38px;
+    }
+
+    .lightboxPrevBtn {
+        left: 8px;
+    }
+
+    .lightboxNextBtn {
+        right: 8px;
+    }
+
+    .lightboxCounter {
+        bottom: 16px;
+        font-size: 12px;
+    }
+}
\ No newline at end of file
diff --git a/frontend/src/pages/qna/QnAListPage.js b/frontend/src/pages/qna/QnAListPage.js
index 3f56a65..7f0e696 100644
--- a/frontend/src/pages/qna/QnAListPage.js
+++ b/frontend/src/pages/qna/QnAListPage.js
@@ -610,6 +610,23 @@ function QnAListPage() {
         setImagePreviews(next.map(f => URL.createObjectURL(f)));
     };
 
+    const handleNewQuestionPaste = (e) => {
+        if (isStaff) return; // 이해도 체크 입력창에는 이미지 첨부 없음
+        const items = e.clipboardData?.items;
+        if (!items) return;
+        for (const item of items) {
+            if (item.type.startsWith('image/')) {
+                const file = item.getAsFile();
+                if (file) {
+                    const merged = [...selectedImages, file].slice(0, 5);
+                    setSelectedImages(merged);
+                    setImagePreviews(merged.map(f => URL.createObjectURL(f)));
+                }
+                break;
+            }
+        }
+    };
+
     // ── 새 질문 등록 ─────────────────────────────────
     const handleNewQuestion = async () => {
         const text = newQuestion.trim();
@@ -945,6 +962,7 @@ function QnAListPage() {
                             onKeyDown={e => {
                                 if (e.key === 'Enter') isStaff ? handleNewUnderstandCheck() : handleNewQuestion();
                             }}
+                            onPaste={handleNewQuestionPaste}
                             disabled={isSubmitting}
                         />
                         <button
@@ -961,4 +979,4 @@ function QnAListPage() {
     );
 }
 
-export default QnAListPage;
+export default QnAListPage;
\ No newline at end of file
diff --git a/frontend/src/utils/Api.js b/frontend/src/utils/Api.js
index 91cdd7c..5a2bd98 100644
--- a/frontend/src/utils/Api.js
+++ b/frontend/src/utils/Api.js
@@ -1,6 +1,26 @@
-export function authFetch(url, options = {}) {
+const LOGIN_PATH = '/login';
+
+// 401 응답을 받았을 때 한 번만 처리되도록 막아주는 플래그
+// (같은 화면에서 여러 API가 동시에 401을 받아도 리다이렉트는 한 번만 실행됨)
+let isRedirectingToLogin = false;
+
+function redirectToLogin() {
+    if (isRedirectingToLogin) return;
+    isRedirectingToLogin = true;
+
+    localStorage.removeItem('token');
+    localStorage.removeItem('role');
+
+    // 이미 로그인 페이지에 있다면 또 이동시키지 않음
+    if (window.location.pathname !== LOGIN_PATH) {
+        window.location.href = LOGIN_PATH;
+    }
+}
+
+export async function authFetch(url, options = {}) {
     const token = localStorage.getItem('token');
-    return fetch(url, {
+
+    const res = await fetch(url, {
         ...options,
         headers: {
             'Content-Type': 'application/json',
@@ -8,4 +28,12 @@ export function authFetch(url, options = {}) {
             ...options.headers,
         },
     });
+
+    if (res.status === 401) {
+        redirectToLogin();
+        // 호출부에서 추가로 catch 처리할 수 있도록 에러를 던짐
+        throw new Error('인증이 만료되었어요. 다시 로그인해주세요.');
+    }
+
+    return res;
 }
\ No newline at end of file