A setting device includes an operating element and a light-emitting device. The operating element is used for specifying a setting value of a first parameter by moving the operating element within a first region. The light-emitting device includes a second region that is disposed inside the first region. The second region includes a light-emitting area that changes according to the setting value. The operating element covers part of the second region. The operating element is an operating element for specifying a setting value of a first parameter related to sound by moving the operating element relative to a housing. The operating element includes a first portion and a second portion. The first portion blocks light. The second portion transmits light from a first surface of the operating element to a second surface facing the first surface.