To provide a bat for a ball game, which can be used easily and can achieve a long flying distance by providing high repulsion characteristics and improving a hitting feeling.

The bat for ball games includes: a body member 2 composed of a hard foamed synthetic resin material constituting almost its entirety from a ball hitting part D to a grip part C; a core rod 3 composed of a hollow pipe material with required elasticity extended over the almost entire length of the body member 2; and a filling member 4 provided inside the core rod 3.