diff --git a/chainer/optimizer.py b/chainer/optimizer.py
index 7973dd585d3f..cff627205008 100644
--- a/chainer/optimizer.py
+++ b/chainer/optimizer.py
@@ -595,6 +595,8 @@ def __init__(self, attr_name):
         self.__doc__ = 'Alias to ``self.hyperparam.{}``'.format(attr_name)
 
     def __get__(self, obj, type=None):
+        if obj is None:
+            return self
         return getattr(obj.hyperparam, self._attr_name)
 
     def __set__(self, obj, value):