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 the 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, the 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 bar portions are actuated by the two protruding portions to swing between an uppermost swing position and a lowermost swing position.