To provide a fitting structure for a hard member and a soft member having a stable holding power against removal even when a lubricant is stuck on a connecting part, and to prevent the formability and productivity of both the members to be formed from being damaged in order to obtain said fitting structure.
In the fitting structure with a cylinder or a conduit composed of the soft member fitting the outer surface of a projection onto its lumen, a columnar projection with steps is configured by forming a plurality of diameter reduction columns to reduce its diameter toward a top side and in the fitting structure for the hard member and the soft member, the top side edge of each diameter reduction column is connected with the lumen surface of the cylinder or of the conduit.
ONO TAKAYUKI
HONGO SUSUMU
TANAKA YASUKAZU
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