diff --git a/optuna/study/study.py b/optuna/study/study.py
index eae8fd0993..bee0ec44d8 100644
--- a/optuna/study/study.py
+++ b/optuna/study/study.py
@@ -334,7 +334,6 @@ def system_attrs(self) -> dict[str, Any]:
         return copy.deepcopy(self._storage.get_study_system_attrs(self._study_id))
 
     @property
-    @experimental_func("3.4.0")
     def metric_names(self) -> list[str] | None:
         """Return metric names.
 
diff --git a/tests/study_tests/test_study.py b/tests/study_tests/test_study.py
index 51411e54d8..6477073e4b 100644
--- a/tests/study_tests/test_study.py
+++ b/tests/study_tests/test_study.py
@@ -1610,9 +1610,3 @@ def test_get_metric_names() -> None:
     assert study.metric_names == ["v0"]
     study.set_metric_names(["v1"])
     assert study.metric_names == ["v1"]
-
-
-def test_get_metric_names_experimental_warning() -> None:
-    study = create_study()
-    with pytest.warns(ExperimentalWarning):
-        study.metric_names