Patent ID: 7297855

Claim:
A keyboard apparatus comprising: a key unit in which a plurality of keys having driving parts are integrally connected by a common base end part in a condition in which said keys are pivotally movable; a support member having a key base end part securing part; and a plurality of mass bodies having driven parts disposed in correspondence to said driving parts of said keys, respectively, and which are disposed in a pivotally movable condition with respect to said support member; wherein an assembled state is achieved when said common base end part of said key unit is secured to said key base end part securing part of said support member and said driving parts of said keys of said key unit are engaged with said corresponding driven parts of said mass bodies, respectively; the keyboard apparatus being configured such that, in the assembled state, in response to a pivotal movement of each of said keys, said corresponding driven parts of said mass bodies are driven by said driving parts of said keys, respectively, so that said corresponding mass bodies pivotally move; and by moving said key unit in a longitudinal direction of said keys in a state in which said plurality of mass bodies are disposed in said support member, said driving parts of all of said keys of said key unit simultaneously engage with said corresponding driven parts of said mass bodies, respectively, and when said driving parts are simultaneously engaged with said driven parts, said common base end part of said key unit is positioned at a position in which said common base end part can be secured to said key base end part securing part of said support member.