Button and button switch thereof

The invention discloses a button and a button switch thereof. The button switch includes a base with a positioning column, an upper cover arranged on the base, a sleeve member, an elastic member, anda triggering elastic arm adjacent to the positioning column, and the sleeve member sleeves the positioning column, penetrates out of the upper cover, and comprises a first protruding rib and a secondprotruding rib. An upward force application portion of the elastic member sleeves the positioning column and is abutted against the sleeve member and the base to enable the sleeve member to move towards the direction far from the base, an extending rod portion of the elastic member extends outwardly from the upward force application portion and is connected to a deflectable rod portion of the elastic member, and the deflectable rod portion is located below the first protruding rib. When the sleeve member is in a high position, the second protruding rib performs biasing on the triggering elastic arm to be deformed in a