| 摘要 |
PROBLEM TO BE SOLVED: To prevent pollution of a pole part by applying a specified surface roughness to a pole part on which a catch is mounted to mount the catch on the pole part smoothly and firmly. SOLUTION: A surface roughness Ra is bellow 0.10μm for a pole part 1 of a pierce earring in which the pole part 1 is made of ceramics while a catch part 2 is made of titanium. As a result, a hole part of the titanium catch us kept from being scraped by the ceramic pole part to eliminate pollution by titanium powder attached. The pole part 1 having a fastening part 1a is inserted into a hole made in an earlobe or the like and the catch 2 is mounted on the pole part 1 opposite to the fastening part 1a to be fixed. The catch 2 is formed by winding both end parts thereof inward and the pole part 1 is grasped elastically by the curved parts 2c. The ceramic member and titanium are unharmful to a human body.
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