To provide a wheeled luggage which are designed to reinforce an extendable rod, ensure ease of control when the luggage is moved, and have increased freedom in a bag body to be carried, and to provide a constituent base frame.

The base frame 1 includes: a carriage surface 2 for detachably carrying a bag body 3 thereon; a hollow support tube 7 connected to at least a part of area at one side of the carriage surface 2, and substantially vertically uprighted to the side opposite to the casters 6 through the carriage surface 2; the extendable rod 5 inserted and connected to the support tube 7 in a self-standing manner, the rod being freely extendable and having a grip 4 provided on one end of the support tube; and a stopper for stopping the extendable rod 5 at an extended position; and a reinforcement wall 8 connecting the support tube 7 and the carriage surface 2 at the uprighted portion of the support tube 7 protruding from the carriage surface 2. The reinforcement wall 8 is connected only at the same single side of the carriage surface 2 as the support tube 7 is connected, and the support tube 7 and the reinforcement wall 8 are positioned substantially in the same plane.