An aluminum frame member according to the present invention has an improved weather-proof characteristics and can be produced through a simplified and inexpensive fabrication process. The aluminum frame member comprises an interior side member and an exterior side member formed separately from each other. The interior side member has a panel support portion at the exterior side, and a surface of the interior side member is coated with a relatively inexpensive coating. The exterior side member has a panel support portion at the interior side, and a surface of the exterior side member is coated with a coating having weather-proof capacity which is higher than that of the coating of the interior side member. The exterior side member is fixed to the exterior side of the interior side member, thereby concealing from the exterior a portion of the interior side member which is otherwise exposed to the exterior.