An FET (11) brings an upper-stream side power supply circuit (101a) into an energized state and brings the upper-stream side power supply circuit (101a) into a cut-off state. An FET (12) brings a down-stream side power supply circuit (101b) into an energized state and brings the down-stream side power supply circuit (101b) into a cut-off state. An FET (13) is connected in parallel with a capacitor (C), turned on to bring the anode and cathode electrodes of the capacitor (C) into an energized state, and turned off to bring the anode and cathode electrodes into a cut-off state. A control unit (50) turns on the FET (11) and the FET (12) and turns off the FET (13), thereby bringing a power supply circuit (101) into an energized state. When receiving a predetermined discharge request in the energized state of the power supply circuit (101), the control unit (50) turns off the FET (11) and turns on the FET (12) and the FET (13). With this configuration, this semiconductor relay control device (1) can appropriately deal with the power supply circuit (101) during an abnormal time.