Opening/closing body control device

An opening/closing body control device comprising:

• an actuator configured to at least one of open and close an opening/closing body of a vehicle;
• a drive device configured to drive the actuator;
• an operation switch that is operated at the at least one of opening and closing of the opening/closing body;
• and
• a signal output device configured to drive the actuator via outputting a signal of a voltage level below a threshold value to the drive device when the operation switch is operated;
• wherein the signal output device includes:
• a signal line connecting the operation switch and the drive device to output the signal to the drive device when the operation switch is operated;
• a submergence detection circuit configured to detect submergence of the vehicle in water;
• a switch configured to turn on when submergence of the vehicle in water is detected and the operation switch is not operated;
• and
• a pullup resistance that is connected via the switch to a power source, the pullup resistance connected electrically to the signal line when the switch turns on to output a signal, a voltage level of which is equal to or greater than the threshold value, to the drive device.