PURPOSE: To stably feed lubricating oil and facilitate fabrication by forming a nearly L-shaped oil feeding passage by a guide member, inside an oil feeding hole on a rotary shaft.

CONSTITUTION: A guide member 31 is prepared by bending a flat metal plate and superposing said metal plate. The guide member 31 is arranged in an oil feeding hole 9 on a rotary shaft 4. A horizontal passage 35 which passes on the revolution center line O of a rotary shaft and an eccentric vertical passage 33 are formed in bending onto the superposed surface of the guide member 31. An L-shaped oil feeding passage is constituted by the above-described both passages. A cover 37 is formed at the opened-port edge of the oil feeding hole 9, and an introducing hole 38 is formed on the revolution center line O of the cover 37.