An operating device includes a rotary shaft, an operating handle, an operating wire, and a drive unit; wherein this drive unit includes: a rotary member, a rotary windup member, a locking device for mutually locking the rotary member and the rotary windup member until the rotary windup member rotates in the forward rotational direction from a first operating position and reaches a second operating position, a lock release device for releasing the lock between the rotary member and the rotary windup member so the rotary windup member rotates in the reverse rotational direction and moves to the first operating position regardless of any operation of the operating handle when the rotary member and the rotary windup member reach the second operating position, and a biasing device for restoring the rotary member to an initial position at which a toilet flush operation can be started from the operating position.