A structure of a push-button switch is disclosed which can prevent the occurrence of a poor conduction caused by the influence of dust which has entered the switch and ensuring a stable contact reliability despite of adopting a contact structure which uses round wire rods. The push-button switch comprises a housing having a receptacle portion, a fixed terminal formed by a wire rod, embedded in the housing, and partially projecting to the exterior of the housing, a fixed contact integral with the fixed terminal and using as a contact portion a partially exposed, raised portion of the wire rod exposed to an inside bottom of the receptacle portion of the housing, and a dome-like movable contact accommodated in the receptacle portion and capable of moving into contact with and away from the fixed contact, wherein a groove is formed in an upper surface of the raised portion of the fixed contact so as to cross the raised portion transversely and/or longitudinally, and the thus grooved-upper surface of the raised portion comes into contact with the movable contact.