diff --git a/tasks/diff_task.rb b/tasks/diff_task.rb
index d3f42b9..721eb6f 100644
--- a/tasks/diff_task.rb
+++ b/tasks/diff_task.rb
@@ -1,8 +1,9 @@
 require "pathname"
 require "tempfile"
 
-require_relative "translated_file"
 require_relative "source_file"
+require_relative "translated_file"
+require_relative "translation_pr"
 
 class DiffTask
   include Rake::DSL
@@ -23,7 +24,14 @@ def define
           translated_file = source_file.find_translated_file(translated_files)
           next unless translated_file
 
-          diff_content = diff(source_file, translated_file)
+          source_latest_commit, diff_content = diff(source_file, translated_file)
+          next unless diff_content
+
+          translation_pr = TranslationPr.new(translation_repository_path,
+                                             translated_file,
+                                             diff_content,
+                                             source_latest_commit)
+          translation_pr.create_or_update
         end
       end
     end
@@ -34,6 +42,7 @@ def define
   def diff(source_file, translated_file)
     translated_commit = translated_file.front_matter[:commit]
     return unless translated_commit
+    return if translated_commit == source_latest_commit
 
     Tempfile.open("diff.txt") do |tempfile|
       sh("git",
@@ -43,7 +52,7 @@ def diff(source_file, translated_file)
          "#{translated_commit}..#{source_latest_commit}",
          source_file.path.to_s,
          {out: tempfile})
-      tempfile.open.read
+      [source_latest_commit, tempfile.open.read]
     end
   end
 
diff --git a/tasks/translated_file.rb b/tasks/translated_file.rb
index 240d0cf..bffbf41 100644
--- a/tasks/translated_file.rb
+++ b/tasks/translated_file.rb
@@ -2,11 +2,25 @@
 require "yaml"
 
 class TranslatedFile
-  attr_reader :path, :front_matter
+  attr_reader :path, :project, :category, :topic
 
   def initialize(path)
     @path = Pathname.new(path)
     @front_matter = parse_front_matter
+    @project, @category, @topic = parse_metadata
+  end
+
+  def content
+    path.read
+  end
+
+  def front_matter
+    parse_front_matter
+  end
+
+  def update_commit_hash(new_commit)
+    updated_content = content.sub(/(commit:\s*")[^"]+(")/, "\\1#{new_commit}\\2")
+    path.write(updated_content)
   end
 
   private
@@ -14,7 +28,6 @@ def initialize(path)
   FRONT_MATTER_REGEXP = /\A---\s*\n(.*?)\n---\s*\n/m
 
   def parse_front_matter
-    content = path.read
     front_matter_section = content.match(FRONT_MATTER_REGEXP)[0]
     if front_matter_section
       YAML.safe_load(front_matter_section, symbolize_names: true)
@@ -22,4 +35,10 @@ def parse_front_matter
       {}
     end
   end
+
+  def parse_metadata
+    project, category, filename = path.to_s.split("/").last(3)
+    topic = filename.sub(".md", "")
+    [project, category, topic]
+  end
 end
diff --git a/tasks/translation_pr.rb b/tasks/translation_pr.rb
new file mode 100644
index 0000000..7d5f159
--- /dev/null
+++ b/tasks/translation_pr.rb
@@ -0,0 +1,146 @@
+require "json"
+require "rake"
+
+class TranslationPr
+  include Rake::FileUtilsExt
+
+  def initialize(repository_path, translated_file, diff_content, source_latest_commit)
+    @repository_path = repository_path
+    @translated_file = translated_file
+    @diff_content = diff_content
+    @source_latest_commit = source_latest_commit
+  end
+
+  def create_or_update
+    current_title, current_description = find_existed_pr
+    Dir.chdir(repository_path) do
+      if current_title && current_description
+        update_pr(branch,
+                  update_description(current_description, diff_content),
+                  source_latest_commit)
+      else
+        create_pr(branch,
+                  title,
+                  generate_description(diff_content),
+                  source_latest_commit)
+      end
+    end
+  end
+
+  private
+
+  attr_reader :translated_file, :repository_path, :diff_content, :source_latest_commit
+
+  DIFF_START = "## Diff (Please don't change this section. It will be automatically updated.)"
+  DIFF_END = "<!-- Please write your description under here. -->"
+
+  def repo
+    "#{onwer}/#{repository}"
+  end
+
+  def owner
+    ENV["TRANSLATED_OWNER"] || "everyleaf"
+  end
+
+  def repository
+    ENV["TRANSLATED_REPOSIOTRY"] || "hotwire_ja"
+  end
+
+  def branch
+    "update-translation-" +
+      "#{translated_file.project}-" +
+      "#{translated_file.category}-" +
+      "#{translated_file.topic}"
+  end
+
+  def title
+    "#{translated_file.project} " +
+      "#{translated_file.category} " +
+      "#{translated_file.topic}: " +
+      "updated translation"
+  end
+
+  def generate_description(diff)
+<<-DESCRIPTION
+#{DIFF_START}
+
+~~~diff
+#{diff}
+~~~
+
+#{DIFF_END}
+
+DESCRIPTION
+  end
+
+  def update_description(description, diff)
+    lines = description.lines
+    diff_start = lines.index { |line| line.strip == DIFF_START }
+    diff_end = lines.index { |line| line.strip == DIFF_END }
+
+    if diff_start && diff_end && diff_start < diff_end
+      before_diffs = lines[0...diff_start].join
+      after_diffs = lines[(diff_end).next..-1].join
+
+      before_diffs + generate_description(diff) + after_diffs
+    else
+      generate_description(diff)
+    end
+  end
+
+  def find_existed_pr
+    pr_raw_info = Tempfile.open("pr.json") do |pr|
+      sh("gh",
+         "pr",
+         "view",
+         branch,
+         "--json", "closed,title,body",
+         "--repo", repo,
+         {out: pr}
+      )
+      pr.open.read
+    end
+    if pr_raw_info.empty?
+      [nil, nil]
+    else
+      pr_info = JSON.parse(pr_raw_info, symbolize_names: true)
+      return [nil, nil] if pr_info[:closed]
+      [pr_info[:title], pr_info[:body]]
+    end
+  end
+
+  def commit_latest_hash(source_latest_commit)
+    translated_file.update_commit_hash(source_latest_commit)
+    sh("git", "add", translated_file.path.to_s)
+    sh("git",
+       "commit",
+       "-m",
+       "updated translation target commit")
+  end
+
+  def update_pr(branch, description, source_latest_commit)
+    sh("git", "fetch")
+    sh("git", "switch", "-c", branch, "origin/#{branch}")
+    commit_latest_hash(source_latest_commit)
+    sh("git", "push", "origin", branch)
+    sh("gh",
+       "pr",
+       "edit",
+       "--body", description,
+       "--repo", repo)
+  end
+
+  def create_pr(branch, title, description, source_latest_commit)
+    sh("git", "switch", "-c", branch)
+    commit_latest_hash(source_latest_commit)
+    sh("git", "push", "origin", branch)
+    sh("gh",
+       "pr",
+       "create",
+       "--title", title,
+       "--body", description,
+       "--base", "auto-translations-update",
+       "--head", branch,
+       "--repo", repo)
+  end
+end