diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 7ab852745..6880d2f03 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -16,6 +16,14 @@ class ApplicationController < ActionController::Base
 
   rescue_from Pundit::NotAuthorizedError, with: :user_not_authorized
 
+  def current_user
+    unless defined?(@current_user)
+      @current_user = session[:userinfo]
+    end
+    @current_user
+  end
+  helper_method :current_user
+
   def user_not_authorized
     render(template: 'errors/error_403', status: 403, layout: 'application', content_type: 'text/html')
   end
diff --git a/app/controllers/attendees_controller.rb b/app/controllers/attendees_controller.rb
index 7625cb269..c117fc66f 100644
--- a/app/controllers/attendees_controller.rb
+++ b/app/controllers/attendees_controller.rb
@@ -3,9 +3,7 @@ class AttendeesController < ApplicationController
   before_action :set_profile, :set_speaker
 
   def logged_in_using_omniauth?
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def index
diff --git a/app/controllers/concerns/secured.rb b/app/controllers/concerns/secured.rb
index 95c1a281f..355e42c71 100644
--- a/app/controllers/concerns/secured.rb
+++ b/app/controllers/concerns/secured.rb
@@ -47,7 +47,7 @@ def logged_in?
   end
 
   def new_user?
-    logged_in? && !Profile.find_by(email: set_current_user[:info][:email], conference_id: set_conference.id)
+    logged_in? && !Profile.find_by(email: current_user[:info][:email], conference_id: set_conference.id)
   end
 
   def admin?
@@ -71,7 +71,7 @@ def event_name
   end
 
   def set_current_user
-    @current_user ||= session[:userinfo]
+    current_user
   end
 
   private
diff --git a/app/controllers/concerns/secured_admin.rb b/app/controllers/concerns/secured_admin.rb
index c28a91f48..3e6b93ed9 100644
--- a/app/controllers/concerns/secured_admin.rb
+++ b/app/controllers/concerns/secured_admin.rb
@@ -35,7 +35,7 @@ def is_admin?
   end
 
   def set_current_user
-    @current_user ||= session[:userinfo]
+    current_user
   end
 
   def get_or_create_admin_profile
diff --git a/app/controllers/concerns/secured_api.rb b/app/controllers/concerns/secured_api.rb
index 011daa182..60310d732 100644
--- a/app/controllers/concerns/secured_api.rb
+++ b/app/controllers/concerns/secured_api.rb
@@ -20,6 +20,6 @@ def logged_in?
   end
 
   def set_current_user
-    @current_user ||= session[:userinfo]
+    current_user
   end
 end
diff --git a/app/controllers/concerns/secured_beta.rb b/app/controllers/concerns/secured_beta.rb
index 153188ff6..3d8ef88a4 100644
--- a/app/controllers/concerns/secured_beta.rb
+++ b/app/controllers/concerns/secured_beta.rb
@@ -14,7 +14,7 @@ def is_beta_user?
   end
 
   def set_current_user
-    @current_user ||= session[:userinfo]
+    current_user
   end
 
   def admin?
diff --git a/app/controllers/concerns/secured_speaker.rb b/app/controllers/concerns/secured_speaker.rb
index 0b91ea992..c8507e4a9 100644
--- a/app/controllers/concerns/secured_speaker.rb
+++ b/app/controllers/concerns/secured_speaker.rb
@@ -15,7 +15,7 @@ def logged_in_using_omniauth?
   end
 
   def set_current_user
-    @current_user = session[:userinfo]
+    current_user
   end
 
   def logged_in?
diff --git a/app/controllers/concerns/secured_sponsor.rb b/app/controllers/concerns/secured_sponsor.rb
index c9736a5a2..57dbf08ed 100644
--- a/app/controllers/concerns/secured_sponsor.rb
+++ b/app/controllers/concerns/secured_sponsor.rb
@@ -15,7 +15,7 @@ def logged_in_using_omniauth?
   end
 
   def set_current_user
-    @current_user = session[:userinfo]
+    current_user
   end
 
   def logged_in?
diff --git a/app/controllers/contents_controller.rb b/app/controllers/contents_controller.rb
index 45ecf5a44..da898f2d2 100644
--- a/app/controllers/contents_controller.rb
+++ b/app/controllers/contents_controller.rb
@@ -3,9 +3,7 @@ class ContentsController < ApplicationController
   before_action :set_profile, :set_speaker
 
   def logged_in_using_omniauth?
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def index
diff --git a/app/controllers/event_controller.rb b/app/controllers/event_controller.rb
index fb3949771..3a3171f8a 100644
--- a/app/controllers/event_controller.rb
+++ b/app/controllers/event_controller.rb
@@ -21,9 +21,7 @@ def show
   end
 
   def set_current_user
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def privacy
diff --git a/app/controllers/profiles_controller.rb b/app/controllers/profiles_controller.rb
index 78bb11ef7..6fe3027d9 100644
--- a/app/controllers/profiles_controller.rb
+++ b/app/controllers/profiles_controller.rb
@@ -9,7 +9,7 @@ class ProfilesController < ApplicationController
   def new
     @profile = Profile.new
     @conference = Conference.find_by(abbr: params[:event])
-    if set_current_user && Profile.find_by(conference_id: @conference.id, email: @current_user[:info][:email])
+    if current_user && Profile.find_by(conference_id: @conference.id, email: @current_user[:info][:email])
       redirect_to(dashboard_path)
     end
     @event = params[:event]
diff --git a/app/controllers/speaker_dashboard/speakers_controller.rb b/app/controllers/speaker_dashboard/speakers_controller.rb
index 7a8e966d2..0c66f96de 100644
--- a/app/controllers/speaker_dashboard/speakers_controller.rb
+++ b/app/controllers/speaker_dashboard/speakers_controller.rb
@@ -16,7 +16,7 @@ def new
     @conference = Conference.find_by(abbr: params[:event])
     @sponsor = Sponsor.find(params[:sponsor_id]) if params[:sponsor_id]
 
-    if set_current_user
+    if current_user
       if Speaker.find_by(conference_id: @conference.id, email: @current_user[:info][:email])
         redirect_to(speaker_dashboard_path)
       end
diff --git a/app/controllers/speaker_dashboards_controller.rb b/app/controllers/speaker_dashboards_controller.rb
index 3192ec2fb..ee8b7f98b 100644
--- a/app/controllers/speaker_dashboards_controller.rb
+++ b/app/controllers/speaker_dashboards_controller.rb
@@ -15,9 +15,7 @@ def sponsor?
   end
 
   def logged_in_using_omniauth?
-    if logged_in?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def set_speaker
diff --git a/app/controllers/speakers_controller.rb b/app/controllers/speakers_controller.rb
index c78ee1b87..bcf6e245e 100644
--- a/app/controllers/speakers_controller.rb
+++ b/app/controllers/speakers_controller.rb
@@ -5,9 +5,7 @@ class SpeakersController < ApplicationController
   before_action :set_profile
 
   def logged_in_using_omniauth?
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   # GET /speakers
diff --git a/app/controllers/sponsor_dashboards/speakers_controller.rb b/app/controllers/sponsor_dashboards/speakers_controller.rb
index 10fee394c..2637f504a 100644
--- a/app/controllers/sponsor_dashboards/speakers_controller.rb
+++ b/app/controllers/sponsor_dashboards/speakers_controller.rb
@@ -8,7 +8,7 @@ def new
     @conference = Conference.find_by(abbr: params[:event])
     @sponsor = Sponsor.find(params[:sponsor_id]) if params[:sponsor_id]
 
-    if set_current_user
+    if current_user
       if Speaker.find_by(conference_id: @conference.id, email: @current_user[:info][:email])
         redirect_to(speaker_dashboard_path)
       end
diff --git a/app/controllers/sponsor_dashboards/sponsor_dashboards_controller.rb b/app/controllers/sponsor_dashboards/sponsor_dashboards_controller.rb
index 5e507da65..ea7a92501 100644
--- a/app/controllers/sponsor_dashboards/sponsor_dashboards_controller.rb
+++ b/app/controllers/sponsor_dashboards/sponsor_dashboards_controller.rb
@@ -34,9 +34,7 @@ def sponsor?
   end
 
   def logged_in_using_omniauth?
-    if logged_in?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def set_sponsor_profile
diff --git a/app/controllers/sponsor_dashboards/sponsor_profiles_controller.rb b/app/controllers/sponsor_dashboards/sponsor_profiles_controller.rb
index 70576a8b5..bbf31cf8e 100644
--- a/app/controllers/sponsor_dashboards/sponsor_profiles_controller.rb
+++ b/app/controllers/sponsor_dashboards/sponsor_profiles_controller.rb
@@ -11,7 +11,7 @@ def new
     unless logged_in?
       redirect_to(sponsor_dashboards_login_path)
     else
-      if set_current_user
+      if current_user
         if SponsorProfile.find_by(conference_id: @conference.id, email: @current_user[:info][:email])
           redirect_to(sponsor_dashboards_path)
         end
diff --git a/app/controllers/talks_controller.rb b/app/controllers/talks_controller.rb
index 934e7a0f4..b5dadfe1b 100644
--- a/app/controllers/talks_controller.rb
+++ b/app/controllers/talks_controller.rb
@@ -4,9 +4,7 @@ class TalksController < ApplicationController
   helper_method :talk_start_to_end
 
   def logged_in_using_omniauth?
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   # - プロポーザルの採択結果を表示する場合
diff --git a/app/controllers/teams_controller.rb b/app/controllers/teams_controller.rb
index 325077b2e..be56ff383 100644
--- a/app/controllers/teams_controller.rb
+++ b/app/controllers/teams_controller.rb
@@ -3,9 +3,7 @@ class TeamsController < ApplicationController
   before_action :set_conference, :set_profile, :set_speaker
 
   def logged_in_using_omniauth?
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def show
diff --git a/app/controllers/timetable_controller.rb b/app/controllers/timetable_controller.rb
index c1d37b552..dc307a64b 100644
--- a/app/controllers/timetable_controller.rb
+++ b/app/controllers/timetable_controller.rb
@@ -3,9 +3,7 @@ class TimetableController < ApplicationController
   before_action :set_profile, :set_speaker
 
   def logged_in_using_omniauth?
-    if session[:userinfo].present?
-      @current_user = session[:userinfo]
-    end
+    current_user
   end
 
   def index
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 32a4ac528..fb829d676 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,9 +1,4 @@
 module ApplicationHelper
-  def current_user
-    return unless session[:userinfo]
-    @current_user ||= session[:userinfo]
-  end
-
   def logged_in?
     !!session[:userinfo]
   end
diff --git a/spec/controllers/application_controller_spec.rb b/spec/controllers/application_controller_spec.rb
new file mode 100644
index 000000000..b3b1f62b1
--- /dev/null
+++ b/spec/controllers/application_controller_spec.rb
@@ -0,0 +1,21 @@
+require 'rails_helper'
+
+RSpec.describe(ApplicationController, type: :controller) do
+  describe '#current_user' do
+    subject { controller.current_user }
+    context 'when omniauth session does not exist' do
+      it { is_expected.to(eq(nil)) }
+    end
+
+    context 'when omniauth session exists' do
+      before do
+        @userinfo = {
+          info: { email: 'alice@example.com' },
+          extra: { raw_info: { sub: 'mock', 'https://cloudnativedays.jp/roles' => '' } }
+        }
+        session[:userinfo] = @userinfo
+      end
+      it { is_expected.to(eq(@userinfo)) }
+    end
+  end
+end