An operation apparatus (100, 200, 300, 400) for operating a seat mounted in a vehicle, the seat having a plurality of movable portions, the operation apparatus comprising: a display section (101, 401); an operation section (101, 404) that detects a touch position having been touched by a user, and generates an operation signal which represents a position, on a display screen of the display section, corresponding to the touch position; a shape image display control section (102, 201,301) that displays, on a display screen of the display section, a shape image representing an outer profile of the seat having the plurality of movable portions which are each part of the seat mounted in the vehicle; an adjustable item display section that displays, on the display screen, the shape image and the adjustable item images, each of which corresponds to the movable portions, includes a name of one of the movable portions of the seat, and forms an area allowing the user to select one of the corresponding movable portions via the operation section; a selection section that selects one of the plurality of movable portions, which has a name of one of the adjustable item text images displayed on the display screen by the adjustable item display section, the one of the adjustable item text images being displayed at a position, on the display screen, corresponding to the touch position represented by the operational signal; an arrow display control section (102, 201, 301, 402) that displays, after one of the plurality of movable portions is selected by the selection section, arrow images representing directions, respectively, in which the selected one of the plurality of movable portions is movable, and the shape image, on the display screen; and a movement instruction section that outputs an instruction signal for moving the one of the plurality of movable portions which is selected by the selection section, in one of the directions which corresponds to one of the arrow images displayed on the display screen by the arrow display control section, the one of the arrow images being displayed at a position, on the display screen, corresponding to the touch position represented by the operation signal. a display section (101, 401); an operation section (101, 404) that detects a touch position having been touched by a user, and generates an operation signal which represents a position, on a display screen of the display section, corresponding to the touch position; a shape image display control section (102, 201,301) that displays, on a display screen of the display section, a shape image representing an outer profile of the seat having the plurality of movable portions which are each part of the seat mounted in the vehicle; an adjustable item display section that displays, on the display screen, the shape image and the adjustable item images, each of which corresponds to the movable portions, includes a name of one of the movable portions of the seat, and forms an area allowing the user to select one of the corresponding movable portions via the operation section; a selection section that selects one of the plurality of movable portions, which has a name of one of the adjustable item text images displayed on the display screen by the adjustable item display section, the one of the adjustable item text images being displayed at a position, on the display screen, corresponding to the touch position represented by the operational signal; an arrow display control section (102, 201, 301, 402) that displays, after one of the plurality of movable portions is selected by the selection section, arrow images representing directions, respectively, in which the selected one of the plurality of movable portions is movable, and the shape image, on the display screen; and a movement instruction section that outputs an instruction signal for moving the one of the plurality of movable portions which is selected by the selection section, in one of the directions which corresponds to one of the arrow images displayed on the display screen by the arrow display control section, the one of the arrow images being displayed at a position, on the display screen, corresponding to the touch position represented by the operation signal.