To provide a Pachinko game machine for preventing the deterioration of operation property in a ball return prevention device during a game.

The ball return prevention device 16 includes: a body member 32; and a gate member 31 turnably and pivotally attached to the body member 32 via a support shaft 36. The body member 32 includes: an attachment base part 39; a wall part 41 extending to the front part of the attachment base part 39; a cover part 42 arranged on the front surface side of the wall part 41; and a press fitting part 45 arranged on the rear side of the cover part 42 and forming a press fitting hole 44 to press-fit the distal end part of the spindle 36. The gate member 31 includes: a base part 34 having a pivotal support hole 37 for inserting the spindle 36 therein; an opening/closing part 30; and a weight part 35 for biasing the opening/closing part 30 to a ball guide passage side. The support shaft 36 is inserted into the pivotal support hole 37, the pivotal support hole 37 and the press fitting hole 44 are serially arranged in a front and a rear. Then, the distal end part of the support shaft 36 is press-fitted and fixed to the press fitting hole 44.