A cover opening-closing apparatus includes a base member having a guide groove, a cover member that is provided with a guide cylinder part disposed so as to be freely movable in the guide groove, a first contact member that contacts the guide cylinder part and moves when the cover member is located at the open position, a second contact member that contacts the guide cylinder part and moves when the cover member is located at the closed position, and a single spring that urges the first contact member moving at the opened position toward the guide cylinder part and urges the second contact member moving at the closed position toward the guide cylinder part.