The subject innovation relates to a service life testing blood taken, the rotation main shaft 12, the rotation of the contact ring 14 fitting inhibiting the major axis and a revolution and rotation are arranged on the outer peripheral surface of the contact ring according to the rotation of the rotary main shaft because it contains a test steel balls 16, and a shaft cup member 18 for supporting the test taken as inclined orientation load to be switched in the circumferential direction of the load on the contact point of the contact ring and the test steel balls, steel balls life of various sizes, which this has the effect of possibly and production and installation are easy to reduce the cost of the test fixture (testing relative rolling contact part of the steel ball), the certification.
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