diff --git a/Gemfile b/Gemfile
index c84311c..248e3e6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,4 +4,9 @@ source "https://rubygems.org"
 gemspec
 
 gem "rake", "~> 12.0"
-gem "rspec", "~> 3.0"
\ No newline at end of file
+gem "rspec", "~> 3.0"
+
+group :test do
+  gem "rails", "~> 6.1.0"
+  gem "generator_spec"
+end 
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index 01551d1..ed625a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,119 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    actioncable (6.1.3.2)
+      actionpack (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (6.1.3.2)
+      actionpack (= 6.1.3.2)
+      activejob (= 6.1.3.2)
+      activerecord (= 6.1.3.2)
+      activestorage (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      mail (>= 2.7.1)
+    actionmailer (6.1.3.2)
+      actionpack (= 6.1.3.2)
+      actionview (= 6.1.3.2)
+      activejob (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (6.1.3.2)
+      actionview (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      rack (~> 2.0, >= 2.0.9)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (6.1.3.2)
+      actionpack (= 6.1.3.2)
+      activerecord (= 6.1.3.2)
+      activestorage (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      nokogiri (>= 1.8.5)
+    actionview (6.1.3.2)
+      activesupport (= 6.1.3.2)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (6.1.3.2)
+      activesupport (= 6.1.3.2)
+      globalid (>= 0.3.6)
+    activemodel (6.1.3.2)
+      activesupport (= 6.1.3.2)
+    activerecord (6.1.3.2)
+      activemodel (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+    activestorage (6.1.3.2)
+      actionpack (= 6.1.3.2)
+      activejob (= 6.1.3.2)
+      activerecord (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      marcel (~> 1.0.0)
+      mini_mime (~> 1.0.2)
+    activesupport (6.1.3.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    builder (3.2.4)
+    concurrent-ruby (1.1.8)
+    crass (1.0.6)
     diff-lcs (1.4.4)
+    erubi (1.10.0)
+    generator_spec (0.9.4)
+      activesupport (>= 3.0.0)
+      railties (>= 3.0.0)
+    globalid (0.4.2)
+      activesupport (>= 4.2.0)
+    i18n (1.8.10)
+      concurrent-ruby (~> 1.0)
+    loofah (2.9.1)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (1.0.1)
+    method_source (1.0.0)
+    mini_mime (1.0.3)
+    minitest (5.14.4)
+    nio4r (2.5.7)
+    nokogiri (1.11.3-x86_64-darwin)
+      racc (~> 1.4)
+    racc (1.5.2)
+    rack (2.2.3)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails (6.1.3.2)
+      actioncable (= 6.1.3.2)
+      actionmailbox (= 6.1.3.2)
+      actionmailer (= 6.1.3.2)
+      actionpack (= 6.1.3.2)
+      actiontext (= 6.1.3.2)
+      actionview (= 6.1.3.2)
+      activejob (= 6.1.3.2)
+      activemodel (= 6.1.3.2)
+      activerecord (= 6.1.3.2)
+      activestorage (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      bundler (>= 1.15.0)
+      railties (= 6.1.3.2)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (6.1.3.2)
+      actionpack (= 6.1.3.2)
+      activesupport (= 6.1.3.2)
+      method_source
+      rake (>= 0.8.7)
+      thor (~> 1.0)
     rake (12.3.3)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
@@ -21,11 +133,27 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
     rspec-support (3.10.2)
+    sprockets (4.0.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.2)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    thor (1.1.0)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
+    websocket-driver (0.7.3)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.4.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  generator_spec
+  rails (~> 6.1.0)
   rake (~> 12.0)
   rspec (~> 3.0)
   sp-rails-saml!
diff --git a/README.md b/README.md
index 7a72843..722211c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # SpRailsSaml
 
-Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/sp_rails_saml`. To experiment with that code, run `bin/console` for an interactive prompt.
+Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/sp-rails-saml`. To experiment with that code, run `bin/console` for an interactive prompt.
 
 TODO: Delete this and the text above, and describe your gem
 
diff --git a/bin/console b/bin/console
index acb178c..016ca06 100755
--- a/bin/console
+++ b/bin/console
@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 
 require "bundler/setup"
-require "sp_rails_saml"
+require "sp-rails-saml"
 
 # You can add fixtures and/or initialization code here to make experimenting
 # with your gem easier. You can also use a different console, if you like.
diff --git a/lib/generators/sp-rails-saml/config_generator.rb b/lib/generators/sp-rails-saml/config_generator.rb
new file mode 100644
index 0000000..a155358
--- /dev/null
+++ b/lib/generators/sp-rails-saml/config_generator.rb
@@ -0,0 +1,26 @@
+require 'rails/generators'
+
+module SpRailsSaml
+  class ConfigGenerator < Rails::Generators::Base
+
+    desc "config/initializersにイニシャライザファイルを作成します"
+
+    def create_initializer_file
+      create_file "config/initializers/sp-rails-saml.rb", default_initializer
+    end
+
+    private
+
+    def default_initializer
+<<-EOS
+SpRailsSaml::Settings.setup do |config|
+  config.sp_entity_id = ''
+  config.name_identifier_format = 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress'
+  config.authn_context = 'urn:oasis:names:tc:SAML:2.0:ac:classes:X509'
+  config.authn_context_comparison = 'exact'
+  config.assertion_consumer_service_url = ''
+end
+EOS
+    end
+  end
+end
diff --git a/lib/sp-rails-saml.rb b/lib/sp-rails-saml.rb
new file mode 100644
index 0000000..00d65e5
--- /dev/null
+++ b/lib/sp-rails-saml.rb
@@ -0,0 +1,7 @@
+require "active_support"
+require 'sp-rails-saml/settings'
+require 'generators/sp-rails-saml/config_generator'
+
+module SpRailsSaml
+  class Error < StandardError; end
+end
diff --git a/lib/sp_rails_saml/settings.rb b/lib/sp-rails-saml/settings.rb
similarity index 81%
rename from lib/sp_rails_saml/settings.rb
rename to lib/sp-rails-saml/settings.rb
index 73a0b8b..9a683b0 100644
--- a/lib/sp_rails_saml/settings.rb
+++ b/lib/sp-rails-saml/settings.rb
@@ -5,10 +5,7 @@ class << self
       attr_accessor :name_identifier_format
       attr_accessor :authn_context
       attr_accessor :authn_context_comparison
-      attr_accessor :idp_sso_service_url
       attr_accessor :assertion_consumer_service_url
-      attr_accessor :idp_cert
-      attr_accessor :idp_entity_id
 
       def setup(options = {})
         options.each do |key, value|
diff --git a/lib/sp_rails_saml/version.rb b/lib/sp-rails-saml/version.rb
similarity index 100%
rename from lib/sp_rails_saml/version.rb
rename to lib/sp-rails-saml/version.rb
diff --git a/lib/sp_rails_saml.rb b/lib/sp_rails_saml.rb
deleted file mode 100644
index 8b067df..0000000
--- a/lib/sp_rails_saml.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-require "sp_rails_saml/version"
-require 'sp_rails_saml/settings'
-
-module SpRailsSaml
-  class Error < StandardError; end
-end
diff --git a/sp-rails-saml.gemspec b/sp-rails-saml.gemspec
index 4792b70..edbb750 100644
--- a/sp-rails-saml.gemspec
+++ b/sp-rails-saml.gemspec
@@ -1,4 +1,5 @@
-require_relative 'lib/sp_rails_saml/version'
+$LOAD_PATH.push File.expand_path('../lib', __FILE__)
+require 'sp-rails-saml/version'
 
 Gem::Specification.new do |spec|
   spec.name          = "sp-rails-saml"
diff --git a/spec/generators/sp_rails_saml/settings_generator_spec.rb b/spec/generators/sp_rails_saml/settings_generator_spec.rb
new file mode 100644
index 0000000..5ea90fe
--- /dev/null
+++ b/spec/generators/sp_rails_saml/settings_generator_spec.rb
@@ -0,0 +1,24 @@
+RSpec.describe SpRailsSaml::ConfigGenerator, type: :generator do
+  destination File.expand_path("../../../../tmp", __FILE__)
+
+  before(:all) do
+    prepare_destination
+    run_generator
+  end
+
+  let(:initializer_text) do
+<<-EOS
+SpRailsSaml::Settings.setup do |config|
+  config.sp_entity_id = ''
+  config.name_identifier_format = 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress'
+  config.authn_context = 'urn:oasis:names:tc:SAML:2.0:ac:classes:X509'
+  config.authn_context_comparison = 'exact'
+  config.assertion_consumer_service_url = ''
+end
+EOS
+  end
+
+  it "should create saml_settings initializer file" do
+    assert_file "config/initializers/sp-rails-saml.rb", initializer_text
+  end
+end
\ No newline at end of file
diff --git a/spec/sp_rails_saml/settings_spec.rb b/spec/sp_rails_saml/settings_spec.rb
index f791f80..8b15890 100644
--- a/spec/sp_rails_saml/settings_spec.rb
+++ b/spec/sp_rails_saml/settings_spec.rb
@@ -4,10 +4,7 @@
     let(:name_identifier_format) { 'name_identifier_format' }
     let(:authn_context) { 'authn_context' }
     let(:authn_context_comparison) { 'authn_context_comparison' }
-    let(:idp_sso_service_url) { 'idp_sso_service_url' }
     let(:assertion_consumer_service_url) { 'assertion_consumer_service_url' }
-    let(:idp_cert) { 'idp_cert' }
-    let(:idp_entity_id) { 'idp_entity_id' }
 
     it 'should set settings value' do
       SpRailsSaml::Settings.setup do |config|
@@ -15,20 +12,14 @@
         config.name_identifier_format = name_identifier_format
         config.authn_context = authn_context
         config.authn_context_comparison = authn_context_comparison
-        config.idp_sso_service_url = idp_sso_service_url
         config.assertion_consumer_service_url = assertion_consumer_service_url
-        config.idp_cert = idp_cert
-        config.idp_entity_id = idp_entity_id
       end
 
       expect(SpRailsSaml::Settings.sp_entity_id).to eq sp_entity_id
       expect(SpRailsSaml::Settings.name_identifier_format).to eq name_identifier_format
       expect(SpRailsSaml::Settings.authn_context).to eq authn_context
       expect(SpRailsSaml::Settings.authn_context_comparison).to eq authn_context_comparison
-      expect(SpRailsSaml::Settings.idp_sso_service_url).to eq idp_sso_service_url
       expect(SpRailsSaml::Settings.assertion_consumer_service_url).to eq assertion_consumer_service_url
-      expect(SpRailsSaml::Settings.idp_cert).to eq idp_cert
-      expect(SpRailsSaml::Settings.idp_entity_id).to eq idp_entity_id
     end
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2122666..14d5d2d 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,6 @@
 require "bundler/setup"
-require "sp_rails_saml"
+require "sp-rails-saml"
+require "generator_spec"
 
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure