To provide a pachinko game machine which enables the mounting of even a heavy game board while making any person easily handle troubles requiring no professional knowledge.

A lower area 35 having transparent windows 32, 33 and 34 in a game board mounting area 31 is formed to make an assembly unit 50 comprising a front plate body 52 and a rear plate body 53. A game ball discharge gutter 71 is so arranged on the upper rim of the front plate body 52 as to let the game balls discharged from the game board 5 flow down as intact and an electric actuator for shooting balls and a speaker box 62 are disposed side by side on the front of the front plate body 52 while board cases 76 and 79 where various electric circuit boards are housed are mounted on the rear of the rear plate body 53. The mounting of the assembly unit 50 in the lower area 35 makes a hammers 58 of the electric actuator for shooting balls respectively disposed in the transparent windows 32, 33 and 34 face a shooting ball supply port 27 of a shooting ball supply device 26 while the front of the speaker box 62 faces a loud speaking hole 15.