Abstract: Proposed is a key switch haying a collapsible balance frame, comprising: a base, a movable plate, a balance frame, a transmission member and a key cap, wherein the movable plate is installed on the base and moves left and right along the base, wherein the balance frame is provided over the movable plate, wherein the balance frame comprises a first bracket and a second bracket arranged on a first side and a second side of the balance frame, respectively, wherein a lower end of the first bracket is connected to the movable plate, and a lower end of the second bracket is connected to the base, wherein a return spring is arranged horizontally, first and second ends of the return spring are (i) respectively connected to the first and the second brackets or (ii) respectively connected to the key cap and any one of the first bracket and the second bracket.