To efficiently supply parts to a production line by eliminating an inconvenience such as an interference at the time of carrying-in of the parts even when products are manufactured by using various types of parts.

In a playing board production line 4, the machines for performing a plurality of processes for manufacturing a playing board are disposed in series in a housing 2. A plurality of inlets 32, 34b, 36b, 38b, and 40b for exclusively carrying necessary parts for each process from the outside of the housing into the housing are provided in the outer wall of the housing near the playing board production line. As required, part storage yards 34a, 36a, 38a, and 40a are provided near the line. By this, the parts necessary in each process of the playing board production line are carried, as necessary, from the outside of the housing into the housing through the exclusive inlets and, if necessary, can be filled in the storage yards. Thus, there occurs no risk of such an inconvenience that the carrying-in of the parts is delayed and the playing board production line is stopped, and the production of the playing board can be performed efficiently.