To prevent a plurality of relays from operating simultaneously by a simple structure.

In an opening/closing device including an opening/closing body 10 to be put in opening/closing operation, a driving source (an electric motor 33b) which operates in two directions to place the opening/closing body 10 in opening/closing operation, and a control circuit 34 which controls the driving source, the control circuit 34 includes a microcomputer 34a which performs arithmetic processing on an input signal by a CPU and outputs a processed signal corresponding to a processing result, a contactless logic circuit 34b which logically processes the processed signal input from the microcomputer 34a without using the CPU and outputs a relay control signal corresponding to a processing result, and a plurality of relays RY1, RY2 which selectively operate with the relay control signal input from the contactless logic circuit 34b, which outputs the relay control signal so that the plurality of relays RY1, RY2 do not operate simultaneously.