Disclosed is technology for driving a switching element, for driving a load, within a suitable temperature range. In a normal control state, the MCS (20), on the basis of power supply voltage or an indication value, transfers the operational state of a motor (60) among PWM drive, DC drive, and output stop. If the MCS (20) determines, as a result of monitoring of output of the self-diagnostic output circuit (40) or output of the temperature detection circuit (70), that an anomaly has occurred, the MCS (20) transfers the motor control state of the motor (60) to fail-safe control (I). Here, if the motor (60) is in PWM drive, the MCS (20) calculates the temperature of the IPS (30) on the basis of the output of the temperature detection circuit (70), and if the temperature is determined to be at least a predetermined temperature, for example, at least 110 degrees, transfers the operational mode of the motor from PWM drive to DC drive.