STEERING CONTROL DEVICE

A steering control device is applied to a steer-by-wire system (901) in which a steering mechanism and a turning mechanism are mechanically separated, or an electric power steering system (902) in which the steering mechanism and the turning mechanism are mechanically coupled. A steering control device (201) applied to the steer-by-wire system (901) controls a drive of a steering motor (78) that functions as a reaction motor that applies reaction torque to a steering wheel (91). A steering wheel lock calculating unit (75) of the steering control device (201) performs a steering wheel lock drive control for calculating a drive command so as to output a lock torque for maintaining a rotation stop state of the steering wheel by energizing the steering motor (78) when a predetermined condition is satisfied while a vehicle is parked or stopped. A power converter (77) converts power supply electric power according to the drive command calculated by the steering wheel lock calculating unit (75) and supplies the electric power to the steering motor.