diff --git a/app/controllers/talks/action_uncompleted_controller.rb b/app/controllers/talks/action_uncompleted_controller.rb
index 3fc19ea5518..bfabaa3faf7 100644
--- a/app/controllers/talks/action_uncompleted_controller.rb
+++ b/app/controllers/talks/action_uncompleted_controller.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class Talks::ActionUncompletedController < ApplicationController
+  include SearchUser
   before_action :require_admin_login
 
   def index
@@ -19,14 +20,4 @@ def index
       @talks = @talks.page(params[:page])
     end
   end
-
-  private
-
-  def validate_search_word(search_word)
-    if search_word.match?(/^[\w-]+$/)
-      search_word.strip if search_word.strip.length >= 3
-    elsif search_word.strip.length >= 2
-      search_word.strip
-    end
-  end
 end
diff --git a/app/controllers/talks_controller.rb b/app/controllers/talks_controller.rb
index 13d25ef93cb..cd40bfa0a36 100644
--- a/app/controllers/talks_controller.rb
+++ b/app/controllers/talks_controller.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class TalksController < ApplicationController
+  include SearchUser
+
   before_action :require_admin_login, only: %i[index]
   before_action :set_talk, only: %i[show]
   before_action :set_user, only: %i[show]
@@ -52,12 +54,4 @@ def set_members
                    .where(id: User.admins.ids.push(@talk.user_id))
                    .order(:id)
   end
-
-  def validate_search_word(search_word)
-    if search_word.match?(/^[\w-]+$/)
-      search_word.strip if search_word.strip.length >= 3
-    elsif search_word.strip.length >= 2
-      search_word.strip
-    end
-  end
 end
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 3e8fd4ae64b..c25d6bf4913 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class UsersController < ApplicationController
+  include SearchUser
+
   skip_before_action :require_active_user_login, raise: false, only: %i[new create show]
   before_action :require_token, only: %i[new] if Rails.env.production?
   before_action :set_user, only: %w[show]
@@ -194,12 +196,4 @@ def require_token
 
     redirect_to root_path, notice: 'アドバイザー・メンター・研修生登録にはTOKENが必要です。'
   end
-
-  def validate_search_word(search_word)
-    if search_word.match?(/^[\w-]+$/)
-      search_word.strip if search_word.strip.length >= 3
-    elsif search_word.strip.length >= 2
-      search_word.strip
-    end
-  end
 end
diff --git a/app/models/search_user.rb b/app/models/search_user.rb
new file mode 100644
index 00000000000..7be513b19ef
--- /dev/null
+++ b/app/models/search_user.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module SearchUser
+  def validate_search_word(search_word)
+    if search_word.match?(/^[\w-]+$/)
+      search_word.strip if search_word.strip.length >= 3
+    elsif search_word.strip.length >= 2
+      search_word.strip
+    end
+  end
+end