diff --git a/app/controllers/bot/bot_omniauth_callbacks_controller.rb b/app/controllers/bot/bot_omniauth_callbacks_controller.rb
index 35b1b09..89561ae 100644
--- a/app/controllers/bot/bot_omniauth_callbacks_controller.rb
+++ b/app/controllers/bot/bot_omniauth_callbacks_controller.rb
@@ -38,8 +38,16 @@ def callback
 
     session[:bot] = bot
 
-    unless Bot.find_by_twitter_id(bot["twitter_id"]).nil?
-      redirect_to(new_bot_path, alert: "すでに登録済みです")
+    already_bot = Bot.find_by_twitter_id(bot["twitter_id"])
+
+    unless already_bot.nil?
+      unless already_bot.deleted
+        redirect_to(new_bot_path, alert: "すでに登録済みです")
+      else
+        already_bot.deleted = false
+        already_bot.save
+        redirect_to bots_path(current_user.username)
+      end
     else
       redirect_to new_bot_path
     end
diff --git a/app/controllers/bot/bots_controller.rb b/app/controllers/bot/bots_controller.rb
index 9f1c5ae..ed6c8fd 100644
--- a/app/controllers/bot/bots_controller.rb
+++ b/app/controllers/bot/bots_controller.rb
@@ -33,13 +33,13 @@ def create
   end
 
   def edit
-    id = params.require(:id)
-    @bot = Bot.find_by(id)
+    bot_param = params.permit(:id)
+    @bot = Bot.find_by(bot_param)
   end
 
   def update
     hash_tag_ids = params[:hash_tags]
-    @bot = Bot.find_by(params.require(:id))
+    @bot = Bot.find_by(params.permit(:id))
 
     unless register_hashtags(hash_tag_ids)
       redirect_to(edit_bot_path(current_user.username, @bot.id), alert: "存在しないHashTagです")
@@ -119,7 +119,7 @@ def register_hashtags(hash_tag_ids)
       end
 
       hash_tag_ids.each do |hash_tag_id|
-        hash_tag = HashTag.find_by({:id => hash_tag_id})
+        hash_tag = HashTag.find_by({:id => hash_tag_id.to_i})
         if @bot.nil? || hash_tag.nil?
           return false
         elsif @bot.hash_tags.include?(hash_tag)
diff --git a/app/controllers/bot/hash_tags_controller.rb b/app/controllers/bot/hash_tags_controller.rb
index 5a81e89..cae7b5d 100644
--- a/app/controllers/bot/hash_tags_controller.rb
+++ b/app/controllers/bot/hash_tags_controller.rb
@@ -13,4 +13,13 @@ def create
       redirect_to(new_hash_tag_path, alert: "すでに登録されているHashTagです")
     end
   end
+
+  def destroy
+    hash_tag_param = params.permit(:id)
+    hash_tag = HashTag.find_by(hash_tag_param)
+    unless hash_tag.nil?
+      hash_tag.destroy
+    end
+    redirect_to hash_tags_path
+  end
 end
diff --git a/app/models/bot.rb b/app/models/bot.rb
index 2e68a5b..135fc6e 100644
--- a/app/models/bot.rb
+++ b/app/models/bot.rb
@@ -6,7 +6,7 @@ class Bot < ActiveRecord::Base
   belongs_to :user
 
   has_many :bot_hash_tag_rels
-  has_many :hash_tags, :through => :bot_hash_tag_rels
+  has_many :hash_tags, :through => :bot_hash_tag_rels, :dependent => :destroy
   has_one :schedule, :dependent => :destroy
 
   validates :twitter_name, presence: true
diff --git a/app/models/hash_tag.rb b/app/models/hash_tag.rb
index 51bb7b9..185b7e3 100644
--- a/app/models/hash_tag.rb
+++ b/app/models/hash_tag.rb
@@ -1,6 +1,6 @@
 class HashTag < ActiveRecord::Base
   has_many :bot_hash_tag_rels
-  has_many :bots, :through => :bot_hash_tag_rels
+  has_many :bots, :through => :bot_hash_tag_rels, :dependent => :destroy
 
     # 論理削除されていないレコードを全取得
     def self.find_by_alive
diff --git a/app/views/bot/bots/index.html.erb b/app/views/bot/bots/index.html.erb
index c1d1d59..9400f14 100644
--- a/app/views/bot/bots/index.html.erb
+++ b/app/views/bot/bots/index.html.erb
@@ -31,7 +31,7 @@
                   <% end %>
                 </td>
                 <td><%= button_to "編集", edit_bot_path(current_user.username, b.id), class: 'btn btn-warning', method: :get %></td>
-                <td><%= button_to "削除", "bot/#{b.id}", class: 'btn btn-danger', method: :delete %></td>
+                <td><%= button_to "削除", destroy_bot_path(current_user.username, b.id), class: 'btn btn-danger', method: :delete %></td>
               </tr>
             <%end%>
           <% end %>
diff --git a/app/views/bot/hash_tags/index.html.erb b/app/views/bot/hash_tags/index.html.erb
index c61e3bf..c810e21 100644
--- a/app/views/bot/hash_tags/index.html.erb
+++ b/app/views/bot/hash_tags/index.html.erb
@@ -11,11 +11,13 @@
         <tr>
           <th>No.</th>
           <th>HashTag</th>
+          <th>削除</th>
         </tr>
         <%  HashTag.all.each_with_index do |b, cnt| %>
           <tr>
             <td><%= cnt+1 %></td>
             <td><%= b.hash_tag %></td>
+            <td><%= button_to "削除", hash_tag_path(b.id), class: 'btn btn-danger', method: :delete %></td>
           </tr>
         <% end %>
       </table>
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index 0f6cc12..7619527 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -18,8 +18,8 @@
         <!-- current_user は現在ログインしているUserオブジェクトを返すdeviseのHelperメソッド -->
         <!-- *_path はUserモデルを作成したときに、
           deviseにより自動で作成されてますので、rake routesで確認できます -->
-        Logged in as <strong><%=link_to current_user.username, bots_path(current_user.username)%></strong>
-        <%= link_to 'プロフィール変更', edit_user_registration_path(current_user.username) %> |
+        Logged in as <strong><%=link_to current_user.username, bots_path(current_user.username)%></strong>|
+             <%= link_to 'HashTagの登録', hash_tags_path %> |
         <%= link_to "ログアウト", destroy_user_session_path, method: :delete %>
       <% else %>
         <%= link_to image_tag("signin_with_twitter_logo.png", :size => "188x30", :class => "twitter_layout"), user_omniauth_authorize_path(:twitter) %>
diff --git a/config/routes.rb b/config/routes.rb
index 11f4601..a801151 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -7,7 +7,7 @@
 
   root to: "home#index"
 
-  resources :hash_tags, :module => :bot, :except => [:show, :edit, :update, :destroy]
+  resources :hash_tags, :module => :bot, :except => [:show, :edit, :update]
 
   devise_scope :user do
     # sessions
@@ -25,9 +25,10 @@
     delete ':username' => 'devise/registrations#destroy'
   end
 
-  resources :bots, :module => :bot, :path => ':username', :except => [:edit, :new, :create]
+  resources :bots, :module => :bot, :path => ':username', :except => [:edit, :new, :create, :destroy]
   match ":username/:id/settings", :to => 'bot/bots#edit', :via => :get, :as => :edit_bot
   match "new", :to => 'bot/bots#new', :via => :get, :as => :new_bot
+  match ":username/:id", :to => 'bot/bots#destroy', :via => :delete, :as => :destroy_bot
   match ":username/bots", :to => 'bot/bots#create', :via => :post, :as => :create_bot
 
   match 'bots/auth/twitter/callback', :to => 'bot/bot_omniauth_callbacks#callback', :via => [:get, :post], :as => :bot_omniauth_callback