A keyswitch assembly for a keyboard for a word processor or a computer comprises a key, a key support mechanism supporting the key formed by pivotally joining two support levers in a scissors-like form, a rubber spring disposed under the key support mechanism, and a support plate supporting the key support mechanism, the rubber spring and a printed wiring board on its surface. The key support mechanism is connected to the key and the support plate by slidably fitting pivots formed on the upper ends of the support levers in the slots of guiding parts formed on the lower surface of the key and slidably fitting pivots formed on the lower ends of the support levers in slots formed by raising portions of the support plate. The omission of a base plate, which is an essential component of a prior art keyswitch assembly, reduces the number of parts and the manufacturing cost and simplifies the construction of the keyswitch assembly.