diff --git a/lib/blue_green_process.rb b/lib/blue_green_process.rb
index c7c40f8..8080dc2 100644
--- a/lib/blue_green_process.rb
+++ b/lib/blue_green_process.rb
@@ -75,5 +75,7 @@ def self.terminate_workers_immediately
     BlueGreenProcess.logger.warn "[BLUE_GREEN_PROCESS][#{$PROCESS_ID}] workerプロセスへTERMシグナルを送信しました"
     Process.waitall
     BlueGreenProcess.logger.warn "[BLUE_GREEN_PROCESS][#{$PROCESS_ID}] workerプロセスが終了しました"
+  ensure
+    FileUtils.rm_rf(BlueGreenProcess::PID_PATH)
   end
 end
diff --git a/lib/blue_green_process/master_process.rb b/lib/blue_green_process/master_process.rb
index edb474b..75245d1 100644
--- a/lib/blue_green_process/master_process.rb
+++ b/lib/blue_green_process/master_process.rb
@@ -115,6 +115,9 @@ def work
     def shutdown
       @processes.each(&:shutdown)
       Process.waitall
+    ensure
+      # 正常終了だとworkerから削除するケースはないんだけど、想定外のエラーが起きた時を考慮してworkerから削除する
+      FileUtils.rm_rf(BlueGreenProcess::PID_PATH)
     end
 
     private
diff --git a/spec/blue_green_process_spec.rb b/spec/blue_green_process_spec.rb
index 80ab1ef..e30a978 100644
--- a/spec/blue_green_process_spec.rb
+++ b/spec/blue_green_process_spec.rb
@@ -43,4 +43,23 @@
       described_class.config.after_fork.call
     end
   end
+
+  describe ".terminate_workers_immediately" do
+    let(:worker_instance) { worker_class.new }
+    let(:worker_class) do
+      Class.new(BlueGreenProcess::BaseWorker) do
+        def work(label)
+          puts "work #{label}"
+        end
+      end
+    end
+
+    it 'workerプロセスを終了すること' do
+      process = BlueGreenProcess.new(worker_instance: worker_instance, max_work: 3)
+      process.work
+      BlueGreenProcess.terminate_workers_immediately
+      expect(Process.waitall).to eq([])
+      expect(File.exist?(BlueGreenProcess::PID_PATH)).to eq(false)
+    end
+  end
 end
diff --git a/spec/integration/after_fork_spec.rb b/spec/integration/after_fork_spec.rb
index cbf64b2..82c4b16 100644
--- a/spec/integration/after_fork_spec.rb
+++ b/spec/integration/after_fork_spec.rb
@@ -56,6 +56,7 @@ def work(label)
            "green" * 2,
            "blue"  * 2].join
         )
+        expect(File.exist?(BlueGreenProcess::PID_PATH)).to eq(false)
       end
     end
   end