To provide a game machine for preventing shock accompanied by operation of an operation means unrelated to a player's operation from being falsely detected as shock accompanied by the operation of the operation means by the player.

A Pachinko game machine 1 includes a performance button 51 operable unrelated to a player's operation. In the Pachinko game machine 1, the player's operation of the performance button 51 is detected by using a first optical sensor 81 and a second optical sensor 82, and shock accompanied by the operation of the performance button 51 is detected by using a shock sensor 99. The shock detected by the shock sensor 99 with timing with which the operation of the performance button 51 detected by the first optical sensor 81 and the second optical sensor 82 is acquired by a CPU 131 of a performance control unit 130 as shock accompanied by operation of the performance button 51 by the player.