To prevent a control board from being detached in normal time such as during the business hours of a game hall.

In the game machine, a main control board case 27 is attached in such a way as horizontally long by inserting a locking lever of the main control board case 27 into an insertion hole on a main board attaching surface disposed on the lower back side of a board attaching base 40, and rotating the locking lever to be in a locked state. The board attaching base 40 has fitting parts 40a and 40b whose cross sections are U-shaped in such a way as to hold the right and left edges of a game board 30 from the front and back surfaces. The board attaching base 40 is attached to the game board 30 by sliding the attaching base 40 upward from below the game board 30, and the game board 30 is fitted to the back side of a front frame of the Pachinko machine. In this way, the main control board case 27 cannot be detached unless the game board 30 is detached from the front frame, so that the main control board case 27 cannot be detached in normal time such as during the business hours of the game hall.