Patent ID: 8263850

Claim:
A percussion detecting apparatus, comprising: a percussion sensor configured to detect a vibration of a pad member being struck, the pad member having a percussion surface adapted to be struck; and an intervening member disposed between the pad member and a support frame, the intervening member having a base surface on which a first protrusion having elasticity is protrudingly formed, wherein at least one of the pad member and the support frame is in contact with said intervening member at the first protrusion of said intervening member when the pad member is in an unstruck state, wherein said intervening member has, as the base surface, a plurality of base surface portions that face different directions and extend along a direction having a component perpendicular to the percussion surface, a plurality of protrusions, including the first protrusion, are formed on respective ones of the plurality of base surface portions so as to protrude in different directions, and a position of the pad member in the unstruck state in a direction parallel to the percussion surface is restricted by the plurality of protrusions.