diff --git a/cliboa/adapter/http.py b/cliboa/adapter/http.py
index 6dd87c67..07e5efa0 100644
--- a/cliboa/adapter/http.py
+++ b/cliboa/adapter/http.py
@@ -44,7 +44,7 @@ def request(self):
     def execute(self):
         self._logger.info("local path: %s" % self._dest_path)
         res = None
-        for _ in range(self._retry_cnt):
+        for attempt in range(self._retry_cnt):
             try:
                 res = self.request()
                 res.raise_for_status()
@@ -55,11 +55,13 @@ def execute(self):
             except Exception as e:
                 self._logger.warning(e)
 
-            self._logger.warning(
-                "Unexpected error occurred during http request. Retry will start in %s",
-                self._retry_intvl_sec,
-            )
-            sleep(self._retry_intvl_sec)
+            # Sleep only when another attempt is scheduled.
+            if attempt < self._retry_cnt - 1:
+                self._logger.warning(
+                    "Unexpected error occurred during http request. Retry will start in %s",
+                    self._retry_intvl_sec,
+                )
+                sleep(self._retry_intvl_sec)
 
         if res is not None:
             raise HTTPError("Http request failed. HTTP Status code: %s" % res.status_code)
diff --git a/tests/adapter/test_http.py b/tests/adapter/test_http.py
index 09cf5f72..9a2d8884 100644
--- a/tests/adapter/test_http.py
+++ b/tests/adapter/test_http.py
@@ -61,6 +61,37 @@ def test_execute_ng(self, mock_get):
         assert "Http request failed" in str(execinfo.value)
 
 
+    @patch("cliboa.adapter.http.sleep")
+    @patch("cliboa.adapter.http.requests.get")
+    def test_execute_ng_no_sleep_after_final_failure(self, mock_get, mock_sleep):
+        # Final failed attempt should not sleep when no further retry is scheduled.
+        mock_get.side_effect = HTTPError("Http request failed.")
+
+        url = "https://spam.com/get"
+        timeout = 1
+        retry_cnt = 1
+        retry_intvl_sec = 1
+        d = Download(url, self._dest_path, timeout, retry_cnt, retry_intvl_sec)
+        with pytest.raises(HTTPError):
+            d.execute()
+        mock_sleep.assert_not_called()
+
+    @patch("cliboa.adapter.http.sleep")
+    @patch("cliboa.adapter.http.requests.get")
+    def test_execute_ng_sleeps_between_retries(self, mock_get, mock_sleep):
+        mock_get.side_effect = HTTPError("Http request failed.")
+
+        url = "https://spam.com/get"
+        timeout = 1
+        retry_cnt = 3
+        retry_intvl_sec = 2
+        d = Download(url, self._dest_path, timeout, retry_cnt, retry_intvl_sec)
+        with pytest.raises(HTTPError):
+            d.execute()
+        assert mock_sleep.call_count == 2
+        mock_sleep.assert_called_with(2)
+
+
 class TestUpload(object):
     def setup_method(self, method):
         self._dest_path = "/tmp/test.result"