PURPOSE: To provide a floating bush bearing which can decrease self-excited vibration caused by dynamic pressure of outside oil film.

CONSTITUTION: A groove 11 which extends circularly in the fixed depth from the upper part of a bearing face 4 in reverse rotational direction of a shaft 1, is formed, a pocket 13 to which a filler opening 12 is communicated at the starting terminal in the rotational direction A of the shaft 1, is formed, and a step part 14 is formed at the end terminal. Oil 7 supplied from the filler opening 12 flows in the groove 11 from the pocket 13 in the rotational direction A of the shaft 1, by viscosity of outer oil film 9 which acts by rotation of a bush 2 to rotate together with the shaft 1, and as it approaches the step part 14 formed at the end terminal in the direction A, system is dammed and dynamic pressure is generated. When self-excited vibration occurrs by being by dynamic pressure to act on the outer oil film 9 on the under side this dynamic pressure increases or decreases in response to that vibration in order to depress the vibration.