Key stabilizer

A key stabilizer, comprising:

• a keycap having a bottom surface and two protruding portions disposed thereon, the keycap moving back and forth along a vertical direction between a top position and a bottom position, each of the two protruding portions having an engaging portion at a bottom end thereof, wherein the bottom surface faces the bottom position, and the two protruding portions are arranged along a horizontal direction that is perpendicular to the vertical direction;
• and
• a balance bar having a hinge portion and two side portions respectively connected to both ends of the hinge portion, wherein the hinge portion is positioned on a rotation axis that is parallel to the horizontal direction, an end of each of the two side portions that is away from the hinge portion being inserted into the engaging portion so that when the keycap moves back and forth along the vertical direction, the two protruding portions are actuated by each other through the balance bar, and the two side portions are actuated by the two protruding portions to swing between an uppermost swing position and a lowermost swing position;
• and
• a base plate and two case bodies disposed thereon, each of the case bodies including an accommodating concavity into which the bottom end of each of the two protruding portions is inserted, wherein the two case bodies respectively correspond to the two protruding portions, the hinge portion of the balance bar is pivotally connected to one side of each of the two case bodies, and the two side portions of the balance bar is accommodated in the two accommodating concavities respectively and connected to the bottom ends of the two protruding portions respectively.