diff --git a/README.md b/README.md
index 1156e1d2..58eb75fd 100644
--- a/README.md
+++ b/README.md
@@ -172,6 +172,13 @@ The option to disable push to a branch. When set to false, the `branch` option i
 
 The option how to render changed file in comment. This action will change PR and workflow summary report format. Available options are `raw` and `summarized`. `raw` will render report comment with expanded results. `summarized` will render report comment using `<details>` tag to summarize by changed files.
 
+#### `outdated-comment-action` (Optional)
+
+- Type: String
+- Default: `"none"`
+
+The option to handle outdated comments in the PR. Available options are `none` and `minimize`. `none` do nothing. `minimize` will minimize outdated action comments.
+
 ## Limitation
 
 - If the `artifact` is deleted, the report will also be deleted, see [`Artifact and log retention policy`](https://docs.github.com/ja/actions/learn-github-actions/usage-limits-billing-and-administration#artifact-and-log-retention-policy) for the retention period of the `artifact`.
diff --git a/dist/action.yml b/dist/action.yml
index 0dbb60cf..8a8dd362 100644
--- a/dist/action.yml
+++ b/dist/action.yml
@@ -44,6 +44,9 @@ inputs:
   comment-report-format:
     description: "The option how to render changed file in comment. `raw` by default."
     required: false
+  outdated-comment-action:
+    description: "The option to handle outdated comments. `none` by default."
+    required: false
 runs:
   using: "node20"
   main: "lib/index.js"
diff --git a/src/client.ts b/src/client.ts
index 4c67e738..432f127b 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -44,6 +44,45 @@ export const createClient = (repository: Repository, octokit: Octokit) => {
         { numOfAttempts: 5 },
       );
     },
+    listComments: async (issueNumber: number): Promise<{ node_id: string; body?: string | undefined }[]> => {
+      return backOff(
+        () =>
+          octokit.paginate(
+            octokit.rest.issues.listComments,
+            {
+              ...repository,
+              issue_number: issueNumber,
+              per_page: 100,
+            },
+            r => r.data,
+          ),
+        { numOfAttempts: 5 },
+      );
+    },
+    minimizeOutdatedComment: async (nodeId: string) => {
+      const _ = await backOff(
+        () =>
+          octokit.graphql(
+            `
+mutation($input: MinimizeCommentInput!) {
+  minimizeComment(input: $input) {
+    minimizedComment {
+      isMinimized
+    }
+  }
+}
+`,
+            {
+              input: {
+                subjectId: nodeId,
+                classifier: 'OUTDATED',
+              },
+            },
+          ),
+        { numOfAttempts: 5 },
+      );
+      return;
+    },
     postComment: async (issueNumber: number, comment: string) => {
       const _ = await backOff(
         () => octokit.rest.issues.createComment({ ...repository, issue_number: issueNumber, body: comment }),
diff --git a/src/comment.ts b/src/comment.ts
index 8b61c264..78244630 100644
--- a/src/comment.ts
+++ b/src/comment.ts
@@ -283,3 +283,9 @@ ${report}
 
   return body;
 };
+
+export const isRegActionComment = ({ artifactName, body }: { artifactName: string; body: string }): boolean => {
+  return (
+    body.includes(`## ArtifactName: \`${artifactName}\``) || body.includes(`## ArtifactName: [\`${artifactName}\`]`)
+  );
+};
diff --git a/src/config.ts b/src/config.ts
index 4d58a243..1106c4e7 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -17,6 +17,7 @@ export interface Config {
   customReportPage: string | null;
   reportFilePath: string | null;
   commentReportFormat: 'raw' | 'summarized';
+  outdatedCommentAction: 'none' | 'minimize';
 }
 
 const validateGitHubToken = (githubToken: string | undefined) => {
@@ -101,6 +102,12 @@ function validateCommentReportFormat(format: string): asserts format is 'raw' |
   }
 }
 
+function validateOutdatedCommentAction(action: string): asserts action is 'none' | 'minimize' {
+  if (action !== 'none' && action !== 'minimize') {
+    throw new Error(`'outdated-comment-action' input must be 'none' or 'minimized' but got '${action}'`);
+  }
+}
+
 export const getConfig = (): Config => {
   const githubToken = core.getInput('github-token');
   const imageDirectoryPath = core.getInput('image-directory-path');
@@ -121,6 +128,8 @@ export const getConfig = (): Config => {
   validateReportFilePath(reportFilePath);
   const commentReportFormat = core.getInput('comment-report-format') || 'raw';
   validateCommentReportFormat(commentReportFormat);
+  const outdatedCommentAction = core.getInput('outdated-comment-action') || 'none';
+  validateOutdatedCommentAction(outdatedCommentAction);
 
   return {
     githubToken,
@@ -136,5 +145,6 @@ export const getConfig = (): Config => {
     customReportPage,
     reportFilePath,
     commentReportFormat,
+    outdatedCommentAction,
   };
 };
diff --git a/src/service.ts b/src/service.ts
index 3263952e..023186d8 100644
--- a/src/service.ts
+++ b/src/service.ts
@@ -10,7 +10,7 @@ import { Config } from './config';
 import { Event } from './event';
 import { findRunAndArtifact, RunClient } from './run';
 import { compare, CompareOutput } from './compare';
-import { createCommentWithTarget, createCommentWithoutTarget } from './comment';
+import { createCommentWithTarget, createCommentWithoutTarget, isRegActionComment } from './comment';
 import * as constants from './constants';
 import { workspace } from './path';
 import { pushImages } from './push';
@@ -115,6 +115,17 @@ const init = async (config: Config) => {
 
 type CommentClient = {
   postComment: (issueNumber: number, comment: string) => Promise<void>;
+  listComments: (issueNumber: number) => Promise<{ node_id: string; body?: string | undefined }[]>;
+  minimizeOutdatedComment: (nodeId: string) => Promise<void>;
+};
+
+const minimizePreviousComments = async (client: CommentClient, issueNumber: number, artifactName: string) => {
+  const comments = await client.listComments(issueNumber);
+  for (const comment of comments) {
+    if (comment.body && isRegActionComment({ artifactName, body: comment.body })) {
+      await client.minimizeOutdatedComment(comment.node_id);
+    }
+  }
 };
 
 type SummaryClient = {
@@ -172,6 +183,9 @@ export const run = async ({
         artifactName: config.artifactName,
         customReportPage: config.customReportPage,
       });
+      if (config.outdatedCommentAction === 'minimize') {
+        await minimizePreviousComments(client, event.number, config.artifactName);
+      }
       await client.postComment(event.number, comment);
     }
     return;
@@ -218,6 +232,9 @@ export const run = async ({
   });
 
   try {
+    if (config.outdatedCommentAction === 'minimize') {
+      await minimizePreviousComments(client, event.number, config.artifactName);
+    }
     await client.postComment(event.number, comment);
 
     log.info('post summary comment');