PURPOSE: To prevent generation of oscillations at a gripping part held by a hand by connecting a cam of a motor-driven ball shooting device and a rotating shaft of a motor by means of a resilient body.

CONSTITUTION: A motor 30 is installed on a support board 29 fixed to a leg 12 of a base 8 by means of a bolt, and a projection 50 for preventing generation of idling is formed on a motor shaft 31 made of a resilient body having hardness, while a hole 51 is formed at a cam connection hole to be fitted fixedly to the projection 50. The motor shaft 31 rotates a cam 32 while it is inserted into and fixed to a connection hole 32a. A thread is formed at an end of the motor shaft 31 while a thread may be formed at the cam connection hole so that the motor shaft 31 and the cam 32 are threadedly connected. By connecting the motor shaft 31 and the cam 32 are connected by means of the resilient body in this way, oscillations generating while the cam 32 is brought into contact with a roller part 14a are absorbed by the motor 31 made of the resilient body. Oscillations by a ball shooting lever 13 are thereby reduced to reduce oscillations transmitted to a gripping part 5 held by a hand.