To provide a game machine plant in which game boards and front frame units are respectively and effectively produced and which can be built in a narrow site by constructing a multi-layer building and rationalizing the production line to solve uneconomical problem that a conventional plant uses the whole plant to produce only game boards or front frame units, which can be independently circulated, because the production line is placed on one floor in a conventional plant.

The building 20 is formed in multi-layer structure. A game board production line 24 is formed on an arbitrary floor 25 in the building 20 and a front frame unit (except the game board) production line 22 is formed on a floor 23 in a lower layer of the floor 26 to place the game board production line 24 and the front frame unit production line 22 in the vertical direction. Both floors 23, 25 are linked by a lift conveyor.