A soundboard, which vibrates and generates tones, does not hit the
mounting member (components); as a result abnormal vibration/noise is not
caused; a contact members are contacted and attached on the both sides of
the soundboard which generates tones; the contact member is softer than
the soundboard; mounting member is harder than the contact members,
mounting members are contacted outside the both contact members; all of
them from the mounting members through the mounting members are held and
fixed with the connect members; the soundboard is detached from the hard
mounting members with the soft contact member (sheet) in between;
therefore the tone characteristics of the soundboard do not deteriorate,
and abnormal vibration/noise caused by resonance of soundboard and other
components do not occur.