To provide a transparent ball for a ball game which has a structure suitable for ball playing practice by a player who is conscious about the center or the center of gravity of a ball.

A center sphere 2 which is visible from outside the main body 1 of a ball is disposed in the center position of the main body 1 of the ball consisting of a material with transparency. In this case, the main body 1 of the ball is a hollow molding of synthetic resin with a uniform film thickness and has a center sphere support 3 which is internally located on the center axis of the main body 1 of the ball, and one of the ends of which is fastened to the internal wall surface of the main body 1. In addition, the center sphere 2 is attached to the center sphere support 3 as an ideal structural design. As an alternative structural design, the internal wall surface of the main body 1 of the ball may be tightly connected to the outer peripheral surface of the center sphere 2. The ratio of the diameter of the main body 1 of the ball to that of the center sphere 2 should preferably be 100:5 to 25.