To provide an operation device enabling a driver to easily operate a device which he/she intends to operate such as a lever switch without mistake without directly and visually recognizing it.

An operation part has an operation lever provided with an annular switch for detecting contact and if a control part determines that a duration time of a contact state detected by the annular switch becomes longer than a predetermined display determination period, the control part instructs the display part to display an operation screen of an operation device corresponding to the annular switch. In the operation screen, function images for indicating respective function of operation devices are arranged in a row for each operation device.