Push-button switch

A push-button switch comprising:

• a housing having an operation surface provided with an operation hole and a housing portion provided therein and connected to the operation hole;
• a plunger provided at an inside of the housing portion and movable between a return position away from the operation surface and an operating position in a middle between the operation surface and the return position along a movable direction intersecting the operation surface;
• an operation unit that extends along the movable direction from an outside of the housing through the operation hole to the inside of the housing portion and is mounted to the housing in a state in which an end on the housing portion side in an extending direction is positioned at an initial position, and has a pressing surface provided at the outside of the housing and disposed so as to face the operation surface, in which the pressing surface is capable of an approaching operation with respect to the operation surface along the movable direction, and the end on the housing portion side moves from the initial position to a pressing position to position the plunger at the return position by the approaching operation;
• a lock lever unit that has a lever body exposed to the outside of the housing and movable in a direction intersecting the movable direction between a first position and a second position, a lever support portion provided at the inside of the housing portion and connected to the lever body so as to be movable together with the lever body, and a holding unit capable of holding the lever body at the second position;
• a transmission mechanism that is provided between the lock lever unit and the plunger inside the housing portion, moves the plunger from the return position to the operating position along the movable direction as the lever body moves from the first position toward the second position, and moves the plunger from the operating position to the return position along the movable direction as the lever body moves from the second position toward the first position;
• a movement regulating portion that is provided between the operation unit and the lock lever unit inside the housing portion, and when the lever body is positioned at the first position, enables movement of the lever body to the second position when the end of the operation unit on the housing portion side is positioned at the initial position, and disables movement of the lever body to the second position when the end of the operation unit on the housing portion side is positioned closer to the operation surface than the initial position in the movable direction;
• a contact mechanism that has a fixed contact portion provided at the inside of the housing portion and a movable contact portion that is provided at the inside of the housing portion so as to face the fixed contact portion, comes into contact with the fixed contact portion when the plunger moves from the return position to the operating position, and separates from the fixed contact portion when the plunger moves from the operating position to the return position;
• and
• a first biasing portion provided inside the housing portion and biasing the plunger from the operating position toward the return position along the movable direction.