A controller includes: a plurality of first drivers that outputs a plurality of drive signals to drive a plurality of motors, respectively, and stops an output of the drive signals with a stop signal; a second driver that outputs a drive signal to drive another motor, and stops an output of the drive signal with a stop signal; a first transmitter that transmits the stop signal to all the first drivers; a second transmitter that transmits the stop signal to the second driver; and a stop signal introduction unit capable of introducing separate stop signals to into the first transmitter and the second transmitter, respectively.