An operation apparatus includes: a detector capable of detecting a slide operation on a surface of the operation apparatus; a shape variator including a variable shape portion which is disposed in a partial region of the surface and whose surface shape is deformable; and a controller which controls the shape variator in such a way that the shape variable portion is formed into a first shape being the same as a surface shape of a region other than the partial region or a second shape different from the first shape. The controller controls the shape variator in such a way that the shape of the variable shape portion is formed into the first shape when the detector detects the slide operation.