PACHINKO GAME MACHINE

PROBLEM TO BE SOLVED: To prevent altering of a game control board by preventing removal of the game control board from a pachinko game machine. SOLUTION: A back mechanism board 87 is pressed via a game board 59 against an inner frame 54 mounted in the outer frame 51 of a pachinko game machine 50 in such a way as to be capable of opening by half. A game control board non-removably mounted on the back member board from the outside is sealed, either singly or into a cover, and is covered with a cover member 103 made from a transparent resin, with one end of the cover member held against the holding part 104 of the back mechanism board. The other end 103b is joined to the back mechanism board; as means for joining it, means for connecting it at portions near journaling means 102, 102b journaling the back mechanism board to the inner frame, and for limiting the relative rotating angle Θ formed by the journaling means to an acute angle are employed, so that the cover member cannot be separated from the back mechanism board.