Keyboard device

A keyboard device comprising:

• a substrate having a top surface, wherein the top surface has an assembling region;
• a keycap disposed above the assembling region, wherein the keycap has a bottom surface facing the assembling region;
• a first connection member connected between the keycap and the assembling region, wherein the first connection member comprises a first assembly side and a second assembly side opposite to the first assembly side, the first assembly side is pivotally connected to the bottom surface of the keycap, and the second assembly side is pivotally connected to the substrate;
• and
• a first elastic arm structure comprising a connection end and a free end opposite to the connection end, wherein the connection end is connected to the first assembly side, and the free end abuts against the bottom surface of the keycap;
• wherein the keycap is selectively moved with respect to the substrate and between a first height position and a second height position, when the keycap is not pressed and thus at the first height position, the free end of the first elastic arm structure elastically abuts against the bottom surface of the keycap.