diff --git a/src/libs/time_watcg.py b/src/libs/time_watcg.py
new file mode 100644
index 0000000..7933e1a
--- /dev/null
+++ b/src/libs/time_watcg.py
@@ -0,0 +1,57 @@
+import time
+
+
+class SimpleLogger:
+    def debug(self, message):
+        print(message)
+
+
+class TimeWatch:
+    def __init__(self, logger=None):
+        if not logger:
+            logger = SimpleLogger()
+        self.logger = logger
+        self.start_time = None
+        self.end_time = None
+
+    def start(self):
+        self.start_time = time.time()
+        self.logger.debug("Timer started.")
+
+    def stop(self):
+        self.end_time = time.time()
+        self.logger.debug("Timer stopped.")
+
+    def elapsed_time(self):
+        if self.start_time is None:
+            raise ValueError("Timer has not been started.")
+        if self.end_time is None:
+            raise ValueError("Timer has not been stopped.")
+        elapsed = self.end_time - self.start_time
+        self.logger.debug(f"Elapsed time: {elapsed} seconds")
+        return elapsed
+
+    def reset(self):
+        self.start_time = None
+        self.end_time = None
+        self.logger.debug("Timer reset.")
+
+    @classmethod
+    def debug(cls, func):
+        def wrapper(*args, **kwargs):
+            instance = cls()    # インスタンスを作成
+            instance.start()
+            result = func(*args, **kwargs)
+            instance.stop()
+            instance.elapsed_time()
+            return result
+        return wrapper
+
+
+if __name__ == "__main__":
+    @TimeWatch.debug
+    def test_function():
+        time.sleep(2)
+        return "Function executed."
+
+    test_function()
\ No newline at end of file