Abstract: A ball throwing apparatus for practicing baseball, tennis and the like and including a rotating body with a ball receiving port on one side and a ball projecting port on the other side, and a ball holder and a held ball releasing provided at the ball projecting port; the ball put through the ball receiving port is accelerated in the direction of rotation of the rotary body, and the ball is projected out from the ball projecting port at a predetermined speed and in an exact predetermined direction by releasing the centrifugal force instantaneously at a previously set angle or projecting the ball out from the ball projecting port in the tangential direction of the circle of rotation of the ball.