An operation device includes an operation part that is provided so as to move relative to a device body in each of a first direction and a second direction from a neutral position. Touch operations on the panel surface of the operation part are detected by a sensor provided to the operation part. A touch operation on the operation part is designated as an operation for selecting an icon group on a screen. A push operation on the operation part, in the first direction or the second direction, is designated as an operation for determining a selection state on the screen. A one-finger tracing operation on the operation part is designated as an operation for changing an icon selected on the screen. A two-finger tracing operation on the operation part is designated as an operation for changing the screen.