A relay includes a fixed contact, a movable contact, a return member of the movable contact, and a case that covers the fixed contact, the movable contact, and the return member. The case is made of a material having transparency or translucency. The relay RS further includes a tray portion that is disposed above the return member and below the fixed contact and holds a fusing residue generated by separation/approach of the movable contact from/to the fixed contact. The relay further includes a cap that covers a portion of a terminal connected to the fixed contact, the portion being exposed from the case. When the cap is attached to the case, at least a portion of the case is exposed without being covered with the cap.