PURPOSE: To prevent the occurrence of shaft displacement when a retainer is attached to a part to which the retainer is attached and to facilitate attachment of retainer.
CONSTITUTION: A retainer holding part 7 to hold a retainer 8 through the force of a spring 6 and a T-shaped grip part 1 are provided. This constitution facilitates application of a force and causes easy attachment of the retainer 8. Guides 3 a distance between which is regulatable are mounted on two sides of the retainer 8. This constitution causes mounting of the retainer 8 on a shaft, being a part to which the retainer is attached, without the occurrence of shaft displacement.
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