To provide a golf bag securely protecting golf clubs and having an increased interval between casters at the bottom for stable traction.

The golf bag includes a travel cover separated into a travel cover for a cap portion which is formed integrally with a cap and a travel cover for a main body portion which protects the main body so as to securely protect the golf clubs and the cap and be conveniently used, and a caster unit including a pair of casters fixed so as to be drawn and returned by a predetermined distance between the corner parts of a lower base board of the golf bag and the right and left sides therefrom to increase the interval between casters. Thus, the golf bag has improved ground contact feeling and stability, can protect the golf clubs stored inside against damage, and is easily towed by employment of the casters.