Push switch

A push switch which is mountable on a mounting board, comprising:

• a substrate having a first surface on which a first fixed contact point and a second fixed contact point surrounding the first fixed contact point are formed, a second surface located opposite to the first surface, a third surface extending from the second surface to a corner in a direction perpendicular to the first surface, and a fourth surface extending from the corner parallel to the first surface;
• and
• a conductive movable contact point having a peripheral edge of the movable contact point which is in contact the second fixed contact point, and a center of the movable contact point contacted by the first fixed contact point when the movable contact point is pressed,
• wherein the third surface or the fourth surface is arranged so as to attach with the mounting board when the push switch is mounted on a mounting board, and
• wherein the corner has a groove recessed with respect to at least one of the third surface and the fourth surface, and the corner is located at a line of intersection between a front surface and a side surface of the mounting board when the push switch is mounted on the mounting board.