Push button switch

A push button switch, comprising:

• a push button that is pushable;
• a movable contact that is linked to the push button;
• and a fixed contact that comes into contact or separates from the movable contact through operation of the movable contact, wherein the push button switch further comprises:
• a light emitting element, emitting light;
• a light receiving element, detecting light,
• wherein the light receiving element is configured to detect light reflected by an object reflecting the light emitted by the light emitting element within a prescribed region;
• a lens for light emission that limits an irradiation range of the light emitted by the light emitting element;
• a lens for light reception that limits a light reception range of light received by the light receiving element;
• an illumination member which illuminates the push button with visible light from an inner side, wherein the movable contact and the fixed contact are disposed in a middle region of an inner space of the push button so as to separate the illumination member from the light emitting element and the light receiving element;
• and
• a light shielding member, disposed in the inner space of the push button and covering the light emitting element and the light receiving element, wherein the light shielding member comprises a light shielding partition part disposed between the lens for light emission and the lens for light reception so as to optically isolate the lens for light emission and the lens for light reception.