To makes a golf bag easily movable.

The bottom 20b of a current golf bag 20 is fitted with an auxiliary bottom 10. The auxiliary bottom 10 is provided with wheels 2 on an outside surface 1a of a cylindrical body 1 having the inside dimensions at which bottoms 20b of a group of the current golf bags 20 are made gently insertable. Its inside surface 1b is provided with a leaf spring 3. When the bottom 20b of the current golf bag 20 is fitted to the main body 1, the bottom 20b is grasped between the leaf spring 3 and an inside surface 1b on the main body side facing the same and is fitted with the auxiliary bottom 10. The current golf bag 20 having no wheel is fitted with such auxiliary bottom 10, by which the effect equivalent to that of the case of the golf bag having the wheels 2 at the bottom from the beginning is attained and the easy moving of the golf bag 20 by rolling the wheels is made possible.