Abstract: An operating device includes a device main body, and an operating body operated by a user. The operating body is movable between a first position and a second position and enables activation of a water-related appliance by moving from the first position to the second position. The device main body includes a marker part that is different in outer surface color from a neighboring area of the device main body. When the operating body is placed at the first position, the operating body hides the marker part from the outside, and, when the operating body is placed at the second position, the operating body exposes at least part of the marker part to the outside.