diff --git a/src/main/java/com/developer/wiki/question/command/application/comment/CommentDeleteService.java b/src/main/java/com/developer/wiki/question/command/application/comment/CommentDeleteService.java
index 922e40e..cab6bb7 100644
--- a/src/main/java/com/developer/wiki/question/command/application/comment/CommentDeleteService.java
+++ b/src/main/java/com/developer/wiki/question/command/application/comment/CommentDeleteService.java
@@ -1,5 +1,7 @@
 package com.developer.wiki.question.command.application.comment;
 
+import com.developer.wiki.common.exception.BadRequestException;
+import com.developer.wiki.common.exception.UnAuthorizedException;
 import com.developer.wiki.question.command.application.dto.PasswordRequest;
 import com.developer.wiki.question.command.domain.Comment;
 import com.developer.wiki.question.command.domain.CommentRepository;
@@ -18,12 +20,29 @@ public class CommentDeleteService {
 
   public void delete(Long id, PasswordRequest passwordRequest, Long userId) {
     Comment comment = commentRepository.findById(id).orElseThrow(EntityNotFoundException::new);
-    if (!Objects.isNull(userId)) {
-      commentRepository.delete(comment);
+    checkInvalidAuthorization(passwordRequest, userId, comment);
+    commentRepository.delete(comment);
+  }
+
+  private void checkInvalidAuthorization(PasswordRequest passwordRequest, Long userId,
+      Comment comment) {
+    if (checkInvalidUser(userId, comment)) {
+      throw new UnAuthorizedException("댓글 삭제 권한이 없습니다.");
+    } else if (checkInvalidAnonymous(passwordRequest, userId, comment)) {
+      throw new UnAuthorizedException("댓글 삭제를 할 수 없습니다.");
     }
-    else if(Objects.isNull(userId) && Objects.nonNull(passwordRequest)){
-      comment.matchPassword(passwordRequest.getPassword());
-      commentRepository.delete(comment);
+  }
+
+  private boolean checkInvalidUser(Long userId, Comment comment) {
+    return Objects.nonNull(userId) && (Objects.isNull(comment.getUser()) || !comment.getUser()
+        .getId().equals(userId));
+  }
+
+  private boolean checkInvalidAnonymous(PasswordRequest passwordRequest, Long userId,
+      Comment comment) {
+    if (Objects.isNull(userId) && !comment.checkPassword(passwordRequest.getPassword())) {
+      throw new BadRequestException("비밀번호가 틀렸습니다.");
     }
+    return Objects.isNull(userId) && Objects.isNull(passwordRequest);
   }
 }
diff --git a/src/main/java/com/developer/wiki/question/command/domain/Comment.java b/src/main/java/com/developer/wiki/question/command/domain/Comment.java
index cebb576..c79a1ce 100644
--- a/src/main/java/com/developer/wiki/question/command/domain/Comment.java
+++ b/src/main/java/com/developer/wiki/question/command/domain/Comment.java
@@ -3,6 +3,7 @@
 import com.developer.wiki.oauth.User;
 import com.developer.wiki.question.util.PasswordEncrypter;
 import java.time.LocalDateTime;
+import java.util.Objects;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.EnumType;
@@ -73,6 +74,9 @@ public void matchPassword(String password) {
   }
 
   public boolean checkPassword(String password) {
+    if (Objects.isNull(this.password)) {
+      return false;
+    }
     if (!PasswordEncrypter.isMatch(password, this.password)) {
       return false;
     }