An outer bottom of an engaging member, which is formed as a tubular shape having a bottom, is contact with an inner wall of a housing existing in the opposite direction of a fitting direction. The engaging member urges and covers one edge of an urging member. As a result, pressure, which the inner wall of the housing receives, can be decreased comparing with the structure, in which the urging member is directly in contact with the inner wall of the housing.

 
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