A keyboard device includes a key, a base plate, a membrane circuit board and a buffering part. The membrane circuit board is disposed on the base plate. The key includes a keycap and a stabilizer bar. The stabilizer bar is connected between the keycap and the base plate. The stabilizer bar includes a main bar part, a first linking part and a first insertion part. The first linking part is connected between the main bar part and the first insertion part. The buffering part is disposed on the base plate or the membrane circuit board and located under the first linking part. While a keycap is moved downwardly relative to the base plate, the linking part of the stabilizer bar is contacted with the buffering part. The contact point between the linking part of the stabilizer bar and the buffering part is used as a fulcrum.