An adhesive applying device includes a robot including a robot arm; a rotor set jig for setting thereat a rotor; a gun including a holder to which a cartridge containing the adhesive is mountable, the gun discharging the adhesive in the cartridge mounted to the holder and being mountable to an end of the robot arm; an electromagnetic valve that performs on/off switching control of supply of compressed air at a predetermined pressure into the cartridge mounted to the holder of the gun; a robot controller that controls an operation of the robot; and an upper-order controller that coordinates and controls the on/off switching control performed by the electromagnetic valve and the control of the operation of the robot performed by the robot controller.