A mobile contact body has a light guiding sheet, a cover sheet, a mobile contact and a light transmitting light guiding section. The light guiding sheet includes a film-like base material and a light emitting section arranged in an uneven state on the base material. The cover sheet is arranged to face the base material. The mobile contact formed of a metal thin plate is mounted in dome-shape withelasticity on the cover sheet at a position which corresponds to the light emitting section. The light guiding section is arranged at a position on the cover sheet, excluding an area where the mobilecontact is arranged or at a position on the light guiding sheet, excluding an area where the light emitting section is formed. In the case of arranging the light guiding section on the light guiding sheet, the mobile contact may be mounted on the light guiding sheet without using the cover sheet.