diff --git a/src/apis/api.js b/src/apis/api.js
index e8256722..9d2068dd 100644
--- a/src/apis/api.js
+++ b/src/apis/api.js
@@ -1,6 +1,6 @@
 import { instance, instanceWithToken } from "./axios";
-import axios from "axios";
 
+// Account 관련 API들
 export const signIn = async (data) => {
   const response = await instance.post("/account/signin/", data);
   if (response.status === 200) {
@@ -20,6 +20,17 @@ export const signUp = async (data) => {
   return response;
 };
 
+export const getUser = async () => {
+  const response = await instanceWithToken.get("/account/info/");
+  if (response.status === 200) {
+    console.log("GET USER SUCCESS");
+  } else {
+    console.log("[ERROR] error while updating comment");
+  }
+  return response.data;
+};
+
+// 추가
 export const getPosts = async () => {
   const response = await instance.get("/post/");
   return response.data;
@@ -64,6 +75,7 @@ export const deletePost = async (id, navigate) => {
 // 과제!!
 export const likePost = async (postId) => {};
 
+// Tag 관련 API들
 export const getTags = async () => {
   const response = await instance.get("/tag/");
   return response.data;
@@ -78,6 +90,10 @@ export const createTag = async (data) => {
   }
   return response; // response 받아서 그 다음 처리
 };
+
+// 추가
+
+// Comment 관련 API들
 export const getComments = async (postId) => {
   const response = await instance.get(`/comment/?post=${postId}`);
   return response.data;
@@ -102,13 +118,14 @@ export const updateComment = async (id, data) => {
     console.log("[ERROR] error while updating comment");
   }
 };
-export const deleteComment = async (id) => {};
-export const getUser = async () => {
-  const response = await instanceWithToken.get("/account/info/");
-  if (response.status === 200) {
-    console.log("GET USER SUCCESS");
+
+// 과제 !!
+export const deleteComment = async (id) => {
+  const response = await instanceWithToken.delete(`/comment/${id}/`);
+  if (response.status === 204) {
+    console.log("DELETE SUCCESS");
+    window.location.reload();
   } else {
-    console.log("[ERROR] error while updating comment");
+    console.log("[ERROR] error while deleting post");
   }
-  return response.data;
 };
diff --git a/src/apis/axios.js b/src/apis/axios.js
index 2e85164e..a50557e0 100644
--- a/src/apis/axios.js
+++ b/src/apis/axios.js
@@ -13,6 +13,8 @@ export const instance = axios.create();
 // Token 있어야 접근 가능한 API들 - 얘는 토큰을 넣어줘야 해요
 export const instanceWithToken = axios.create();
 
+// ⬇️ 추가
+// instanceWithToken에는 쿠키에서 토큰을 찾고 담아줍시다!
 instanceWithToken.interceptors.request.use(
   // 요청을 보내기전 수행할 일
   // 사실상 이번 세미나에 사용할 부분은 이거밖에 없어요
diff --git a/src/components/Comment/CommentElement.jsx b/src/components/Comment/CommentElement.jsx
index fd48385e..fa425a14 100644
--- a/src/components/Comment/CommentElement.jsx
+++ b/src/components/Comment/CommentElement.jsx
@@ -1,59 +1,83 @@
 import { useState, useEffect } from "react";
+import { updateComment, getUser } from "../../apis/api";
+import { getCookie } from "../../utils/cookie";
 
 const CommentElement = (props) => {
-    const { comment, handleCommentDelete, postId } = props;
-    const [content, setContent] = useState(comment.content);
-    const [isEdit, setIsEdit] = useState(false);
-
-    const [onChangeValue, setOnChangeValue] = useState(content); // 수정 취소 시 직전 content 값으로 변경을 위한 state
-
-    // comment created_at 전처리
-    const date = new Date(comment.created_at);
-    const year = date.getFullYear();
-    let month = date.getMonth() + 1;
-    month = month < 10 ? `0${month}` : month;
-    let day = date.getDate();
-    day = day < 10 ? `0${day}` : day;
-
-    const handleEditComment = () => { // add api call for editing comment
-        setContent(onChangeValue);
-        setIsEdit(!isEdit);
-        console.log({
-            post: postId,
-            comment: comment.id,
-            content: content
-        });
-    };
-
-    useEffect(() => { // add api call to check if user is the author of the comment
-    }, []);
-
-    return (
-        <div className="w-full flex flex-row justify-between items-center mb-5">
-            <div className="w-3/4 flex flex-col gap-1">
-                {isEdit ? (
-                    <input className="input mb-2" value={onChangeValue} onChange={(e) => setOnChangeValue(e.target.value)} />
-                ) : (
-                    <p className="text-lg">{content}</p>
-                )}
-
-                <span className="text-base text-gray-300">{year}.{month}.{day}</span>
-            </div>
-
-            <div className="flex flex-row items-center gap-3">
-                {isEdit ? (
-                    <>
-                        <button onClick={() => { setIsEdit(!isEdit); setOnChangeValue(content); }}>취소</button>
-                        <button onClick={handleEditComment}>완료</button>
-                    </>
-                ) : (
-                    <>
-                        <button onClick={() => handleCommentDelete(comment.id)}>삭제</button>
-                        <button onClick={() => setIsEdit(!isEdit)}>수정</button>
-                    </>
-                )}
-            </div>
-        </div>
-    );
+  const { comment, handleCommentDelete, postId } = props;
+  const [content, setContent] = useState(comment.content);
+  const [isEdit, setIsEdit] = useState(false);
+  const [user, setUser] = useState(null); // state for user
+
+  const [onChangeValue, setOnChangeValue] = useState(content); // 수정 취소 시 직전 content 값으로 변경을 위한 state
+
+  // comment created_at 전처리
+  const date = new Date(comment.created_at);
+  const year = date.getFullYear();
+  let month = date.getMonth() + 1;
+  month = month < 10 ? `0${month}` : month;
+  let day = date.getDate();
+  day = day < 10 ? `0${day}` : day;
+
+  const handleEditComment = async () => {
+    await updateComment(comment.id, { content: onChangeValue });
+    setIsEdit(!isEdit);
+  };
+
+  // get user info
+  useEffect(() => {
+    if (getCookie("access_token")) {
+      const getUserAPI = async () => {
+        const user = await getUser();
+        setUser(user);
+      };
+      getUserAPI();
+    }
+  }, []);
+
+  return (
+    <div className="w-full flex flex-row justify-between items-center mb-5">
+      <div className="w-3/4 flex flex-col gap-1">
+        {isEdit ? (
+          <input
+            className="input mb-2"
+            value={onChangeValue}
+            onChange={(e) => setOnChangeValue(e.target.value)}
+          />
+        ) : (
+          <p className="text-lg">{content}</p>
+        )}
+
+        <span className="text-base text-gray-300">
+          {year}.{month}.{day}
+        </span>
+      </div>
+
+      <div className="flex flex-row items-center gap-3">
+        {user?.id === comment.author.id ? (
+          isEdit ? (
+            <>
+              <button
+                onClick={() => {
+                  setIsEdit(!isEdit);
+                  setOnChangeValue(content);
+                }}
+              >
+                취소
+              </button>
+              <button onClick={handleEditComment}>완료</button>
+            </>
+          ) : (
+            <>
+              <button onClick={() => handleCommentDelete(comment.id)}>
+                삭제
+              </button>
+              <button onClick={() => setIsEdit(!isEdit)}>수정</button>
+            </>
+          )
+        ) : null}
+        {}
+      </div>
+    </div>
+  );
 };
 export default CommentElement;
diff --git a/src/components/Comment/index.jsx b/src/components/Comment/index.jsx
index c8c4a27e..8da95de7 100644
--- a/src/components/Comment/index.jsx
+++ b/src/components/Comment/index.jsx
@@ -1,53 +1,76 @@
-import { useState } from "react";
-import comments from "../../data/comments"; // dummy data
+import { useState, useEffect } from "react";
+import { getComments, createComment, deleteComment } from "../../apis/api"; // dummy data
 import CommentElement from "./CommentElement";
+import { getCookie } from "../../utils/cookie";
 
 const Comment = ({ postId }) => {
-    const [commentList, setCommentList] = useState(comments); // state for comments
-    const [newContent, setNewContent] = useState(""); // state for new comment
+  const [commentList, setCommentList] = useState([]); // state for comments
+  const [newContent, setNewContent] = useState({
+    post: postId,
+    content: "",
+  });
+  const [isSignedIn, setIsSignedIn] = useState();
 
-    const handleCommentSubmit = (e) => {
-        e.preventDefault();
-        setCommentList([ // TODO: add api call for creating comment
-            ...commentList,
-            {
-                id: commentList.length + 1,
-                content: newContent,
-                created_at: new Date().toISOString(),
-                post: postId,
-                author: {
-                    id: 1,
-                    username: "user1"
-                }
-            }
-        ]);
-        console.log({
-            post: postId,
-            content: newContent
-        });
-        setNewContent("");
+  useEffect(() => {
+    const getCommentsAPI = async () => {
+      const comments = await getComments(postId);
+      setCommentList(comments);
     };
+    getCommentsAPI();
+    const signIn = getCookie("access_token") ? true : false;
+    setIsSignedIn(signIn);
+  }, []);
 
-    const handleCommentDelete = (commentId) => {
-        console.log("comment: ", commentId);
-        setCommentList(commentList.filter((comment) => comment.id !== commentId)); // TODO: add api call for deleting comment
-    };
+  const handleCommentSubmit = async (e) => {
+    e.preventDefault();
+    await createComment({ post: postId, content: newContent });
+    setNewContent("");
+  };
+
+  const handleCommentDelete = async (commentId) => {
+    const confirmDelete = window.confirm("정말 삭제하시겠습니까?");
+    if (!confirmDelete) return;
+    try {
+      await deleteComment(commentId);
+    } catch (error) {
+      console.error(error);
+    } // TODO: add api call for deleting comment
+  };
+
+  return (
+    <div className="w-full mt-5 self-start">
+      <h1 className="text-3xl font-bold my-5">Comments</h1>
+      {commentList.map((comment) => {
+        return (
+          <CommentElement
+            key={comment.id}
+            comment={comment}
+            handleCommentDelete={handleCommentDelete}
+            postId={postId}
+          />
+        );
+      })}
 
-    return (
-        <div className="w-full mt-5 self-start">
-            <h1 className="text-3xl font-bold my-5">Comments</h1>
-            {commentList.map((comment) => {
-                return (
-                    <CommentElement key={comment.id} comment={comment} handleCommentDelete={handleCommentDelete} postId={postId} />
-                );
-            })}
-            
-            <form className="flex flex-row mt-10 gap-3" onSubmit={handleCommentSubmit}>
-                <input type="text" value={newContent} placeholder="댓글을 입력해주세요" className="input" style={{ width: "calc(100% - 100px)" }} onChange={(e) => setNewContent(e.target.value)} />
-                <button type="submit" className="button">작성</button>
-            </form>
-        </div>
-    );
+      {isSignedIn ? (
+        <form
+          className="flex flex-row mt-10 gap-3"
+          onSubmit={handleCommentSubmit}
+        >
+          <input
+            type="text"
+            value={newContent.content}
+            placeholder="댓글을 입력해주세요"
+            className="input"
+            style={{ width: "calc(100% - 100px)" }}
+            onChange={(e) => setNewContent(e.target.value)}
+          />
+          <button type="submit" className="button">
+            작성
+          </button>
+        </form>
+      ) : null}
+    </div>
+  );
 };
 
 export default Comment;
diff --git a/src/routes/PostDetailPage.jsx b/src/routes/PostDetailPage.jsx
index 76e77169..ca30185b 100644
--- a/src/routes/PostDetailPage.jsx
+++ b/src/routes/PostDetailPage.jsx
@@ -2,29 +2,30 @@ import { useState, useEffect } from "react";
 import { useParams, Link, useNavigate } from "react-router-dom";
 import { BigPost } from "../components/Posts";
 import Comment from "../components/Comment";
+
 import { getPost, getUser, deletePost } from "../apis/api";
 import { getCookie } from "../utils/cookie";
 
-import posts from "../data/posts";
-
 const PostDetailPage = () => {
   const { postId } = useParams();
   const [post, setPost] = useState(null);
-  const [user, setUser] = useState();
+
+  const [user, setUser] = useState(null);
+
   useEffect(() => {
     const getPostAPI = async () => {
-      const posts = await getPost(postId);
-      setPost(posts);
+      const post = await getPost(postId);
+      setPost(post);
     };
     getPostAPI();
   }, [postId]);
+
   useEffect(() => {
     // access_token이 있으면 유저 정보 가져옴
     if (getCookie("access_token")) {
       const getUserAPI = async () => {
         const user = await getUser();
         setUser(user);
-        console.log(user);
       };
       getUserAPI();
     }
@@ -34,6 +35,7 @@ const PostDetailPage = () => {
   const onClickDelete = async () => {
     const confirmDelete = window.confirm("정말 삭제하시겠습니까?");
     if (!confirmDelete) return;
+
     try {
       await deletePost(postId, navigate);
     } catch (error) {