Abstract: An operation apparatus configured to operate a ship propulsion machine includes: a remote control device including a holder and an operation lever swingably supported, and configured to perform a shift switching operation of the ship propulsion machine and an operation of increasing/decreasing a rotation speed of a power source of the ship propulsion machine; a gauge device including a display device and configured to display information regarding the ship propulsion machine including information indicating a shift position of the ship propulsion machine and the rotation speed of the power source; and a case to which the remote control device and the gauge device are each attached, and which integrates the remote control device and the gauge device. In the case, the remote control device and the gauge device are disposed adjacently to each other in a front-rear direction of the ship.