INJECTION MOLDING SYSTEM, INJECTION MOLDING MACHINE, AND PERIPHERAL DEVICE

An injection molding system capable of easily calculating relative position information between a movable part of an injection molding machine and a movable part of a peripheral device is provided. A first control unit 110 of an injection molding machine 2 calculates first relative position information which is relative position information of a first movement position M1 set to a movable part 50 in relation to a first reference position K1 set to a first connection portion 80. A second control unit 210 of a robot 3 calculates second relative position information which is relative position information of a second movement position M2 set to a hand 65 in relation to a second reference position K2 set to a second connection portion 85. The first control unit 110 and the second control unit 210 calculate inter-drive-unit relative position information which is relative position information between the first movement position M1 and the second movement position M2 on the basis of the first relative position information and the second relative position information.