The invention relates to a key. The key comprises a bottom plate, a circuit layer, a keycap and a balance rod, wherein the bottom plate is provided with hook parts and first through holes; the circuit layer is provided with a first sub-layer and a second sub-layer; the first sub-layer is provided with second through holes, buffering parts, connection parts and extension parts; each second through hole is provided with a first edge and a second edge; each buffering part is connected with the corresponding first edge and one end of the corresponding connection part; the opposite end of each connection part is connected with the corresponding second edge; each extension part is connected with the corresponding first edge and/or the corresponding second edge; the second sub-layer is arranged between the bottom plate and the first sub-layer, and is provided with third through holes and support parts; each third through hole is provided with a third edge and a fourth edge; each support part is at least partly superposed below the corresponding extension part, and is correspondingly connected with the corresponding third edge and/or the corresponding fourth edge; the balance rod is connected with the keycap, and is propped against the buffering parts. The key provided by the invention has the advantages that second rod parts of the balance rod are supported by the buffering parts, and the second sub-layer is propped against the first sub-layer when the first sub-layer is deformed, so that collision between the second rod parts and the bottom plate can be reduced, and the effect of noise reduction can be further achieved.