To provide a bearing device for a swing arm, in which initial splash of lubricant is suppressed, and torque fluctuation is not much even if it is equivalent to the current torque, and which has a high rigidity.

In this rolling bearing 1, a swing arm 13 is rockably attached to a cylindrical housing 29 rotatably supported by rolling bearings 7, 17 on a fixed shaft. In this case, lubricant is oiled to a rolling part of the rolling bearing, a torque fluctuation at the time of rolling of the swing arm 13 is kept small by giving a pre-load of 500 gf-2000 gf between inner rings 23, 33 and outer rings 21, 31 and rigidity of the rolling bearing 1 is enhanced.