PURPOSE: To improve a bearing characteristic, long-term reliability and safety by providing on the inner periphery surface of a bearing to support a rotary shaft a cylindrical fluoric resin material provided with plural penetration holes in the axial direction of a circumferential groove, providing in addition a stop ring at a bearing end portion.

CONSTITUTION: When a rotary shaft 1 is in stop state, a lubricant 4 is supplied, then it flows through an outer periphery groove 10b and is guided into an inner periphery groove 10a through a penetration hole 13. Thus, the lubricant is supplied to the slide surfaces of a rotary side bearing opening 7a and a bearing side bearing opening 7b. Meanwhile, when the rotary shaft 1 starts to rotate, the slide surfaces of the rotary side bearing opening 7a and the bearing side bearing opening 7b fall into a boundary lubrication (the middle of fluid lubrication and solid lubrication) state. At this time, by the elastic deformation of a fluoric resin material 9, the slide surfaces of the rotary side bearing opening 7a and the bearing side bearing opening 7b fall rather into a state near to fluid lubrication out of the boundary lubrication. That is, the state of elastic fluid lubrication is brought on.