To provide a pachinko game machine which is lightweight, and of which the cost is low, and at the same time, which is equipped with a hinge of a high strength, and is excellent in durability.

This pachinko game machine comprises a front frame 3 and an external frame 4 which turnably and openably holds the front frame 3 in the approximately horizontal direction through an upper hinge and a lower hinge 2. The upper hinge and the lower hinge 2 comprise a receiving section 21 and an engaging section 22. The receiving section 21 at least on one of the upper hinge and the lower hinge 2 is equipped with a vertical plate section 211 and a lateral plate section 213. At the same time, a vertical plate protruding section 212 is provided on the vertical plate section 211, and a lateral plate protruding section 214 wherein a pin 215 or a pin hole 226 is formed, is provided on the lateral plate section 213 respectively. The vertical plate protruding section 212 and the lateral plate protruding section 214 form an L-shape section 210 wherein both sections are integrally connected into an L-shape when seen from the cross section.