A push-button for a game machine which is mounted on the game machine includes an operation key configured to accept a press, a side surface portion having translucency and provided in a direction vertical to a pressing direction of the operation key as viewed from the operation key, a light source configured to apply light in a direction parallel to the pressing direction, and a light guiding portion configured to guide light applied from the light source. The light guiding portion includes a first reflective structure configured to reflect at least a part of the light applied from the light source, and a second reflective structure configured to reflect at least a part of the light reflected by the first reflective structure toward the side surface portion.