diff --git a/app/controllers/admin/sponsor_contact_invites_controller.rb b/app/controllers/admin/sponsor_contact_invites_controller.rb
index 4f92ff24e..f24098537 100644
--- a/app/controllers/admin/sponsor_contact_invites_controller.rb
+++ b/app/controllers/admin/sponsor_contact_invites_controller.rb
@@ -12,7 +12,7 @@ def create
       @sponsor_contact_invite = SponsorContactInvite.new(sponsor_contact_invite_params)
       @sponsor_contact_invite.conference_id = @conference.id
       @sponsor_contact_invite.token = SecureRandom.hex(50)
-      @sponsor_contact_invite.expires_at = 1.days.from_now  # 有効期限を1日後に設定
+      @sponsor_contact_invite.expires_at = 7.days.from_now  # 有効期限を7日後に設定
       if @sponsor_contact_invite.save
         SponsorContactInviteMailer.invite(@conference, @sponsor_contact_invite).deliver_now
         flash.now[:notice] = '招待メールを送信しました'
diff --git a/app/views/sponsor_contact_invite_mailer/invite.text.erb b/app/views/sponsor_contact_invite_mailer/invite.text.erb
index cde873b01..66e3cc2b7 100644
--- a/app/views/sponsor_contact_invite_mailer/invite.text.erb
+++ b/app/views/sponsor_contact_invite_mailer/invite.text.erb
@@ -3,6 +3,6 @@
 
 <%= @new_accept_url %>
 
-このURLは24時間有効です。
+このURLは1週間有効です。
 
 <%= render '/layouts/footer' %>