A motor control device comprising: a plurality of control circuits (21, 31) configured to control power supply to a plurality of winding groups (14, 15) of a plurality of systems in a motor, the power supply being controlled independently for each of the systems and the number of the control circuits (21, 31) being the same as the number of the systems; a communication line (41, 42) configured to transmit and receive, between the control circuits (21, 31), a state signal that indicates a state of each of the systems and that is generated by each of the control circuits (21, 31); the motor control device being characterized by comprising: a signal line (43, 44) configured to transmit and receive, between the control circuits (21, 31), a periodic pulse signal that indicates normal operation of each of the control circuits (21, 31) and that is generated by each of the control circuits (21, 31), wherein each of the control circuits (21, 31) is configured to determine whether an abnormality has occurred in communication through the communication line (41, 42) or whether a function of the control circuit (21, 31) of another system is stopped, based on a combination of whether the communication through the communication line (41, 42) is established and whether the periodic pulse signal of the other system, which is acquired through the signal line (43, 44), is established. a plurality of control circuits (21, 31) configured to control power supply to a plurality of winding groups (14, 15) of a plurality of systems in a motor, the power supply being controlled independently for each of the systems and the number of the control circuits (21, 31) being the same as the number of the systems; a communication line (41, 42) configured to transmit and receive, between the control circuits (21, 31), a state signal that indicates a state of each of the systems and that is generated by each of the control circuits (21, 31); the motor control device being characterized by comprising: a signal line (43, 44) configured to transmit and receive, between the control circuits (21, 31), a periodic pulse signal that indicates normal operation of each of the control circuits (21, 31) and that is generated by each of the control circuits (21, 31), wherein each of the control circuits (21, 31) is configured to determine whether an abnormality has occurred in communication through the communication line (41, 42) or whether a function of the control circuit (21, 31) of another system is stopped, based on a combination of whether the communication through the communication line (41, 42) is established and whether the periodic pulse signal of the other system, which is acquired through the signal line (43, 44), is established. a signal line (43, 44) configured to transmit and receive, between the control circuits (21, 31), a periodic pulse signal that indicates normal operation of each of the control circuits (21, 31) and that is generated by each of the control circuits (21, 31), wherein each of the control circuits (21, 31) is configured to determine whether an abnormality has occurred in communication through the communication line (41, 42) or whether a function of the control circuit (21, 31) of another system is stopped, based on a combination of whether the communication through the communication line (41, 42) is established and whether the periodic pulse signal of the other system, which is acquired through the signal line (43, 44), is established.