Motor device

A motor device having a hollow casing, in which a mechanism for converting continuous rotational motion of a rotational member which is rotated by a motor into reversible rotational motion while contacting a first inner wall of said hollow casing and for transmitting the converted motion to an output shaft, comprising:

• an oscillating member which oscillates about said output shaft;
• and
• a driving force conversion interposed between said oscillating member and said rotational member, which converts continuous rotational motion of said rotational member into reciprocating oscillator motion of said oscillating member;
• wherein said driving, force conversion member comprises at least one contacting portion which projects toward a second inner wall of said hollow casing which is opposed to said first inner wall thereof, said one contactinig portion being formed as one unitary body with said driving force conversion member;
• and
• wherein said at least one contacting portion slides on said second inner wall of said hollow casing over the range of movement of said driving force conversion member, and is formed from a material which is capable of absorbing sound generated by sliding motion.