Abstract: The key switch includes a key, a linkage assembly having first and second linking members with arms connected to outer ends thereof, and a bow-shaped elastic object connected between the arms, which is lowered and raised with the key, the first and second linking members including a coupling recess and a coupling protrusion and inner end thereof and hinge protrusions at side surfaces thereof, the coupling recess and protrusion being engaged with each other to constitute a linkage rotating shaft, a frame including hinge hooks engaged with the hinge protrusions, and an FPC placed on the frame for operation by contact with the linkage assembly. As the key is operated, the arms rotated downward while the linkage rotating shaft rises, and the elastic object gradually flattens and then bends into an upwardly convex bow shape, thereby providing a clicking sensation and a restoring force to the linkage assembly.