ROTATION ELECTRICAL MACHINE

PROBLEM TO BE SOLVED: To facilitate work for removing foundry sand after founding a bearing bracket.SOLUTION: A bearing structure of a rotation electrical machine has a rolling bearing 10, a bearing bracket 20, a runner 50, etc. The bearing bracket 20 is provided in the outer periphery of a rotating axis 1 to hold the rolling bearing 10 and to form an annular first space 70 on one end side of the rolling bearing 10 in the axial direction. A discharge passage 26 is formed in the bearing bracket 20 to communicate with the first space 70, and a lubricant to lubricate the rolling bearing 10 is discharged to the discharge passage 26 through the first space 70. The annular runner 50 is positioned in the first space 70 and fixed in the outer periphery of the rotating axis 1. An inner peripheral surface of the bearing bracket 20 which forms the outer peripheral surface of the first space 70 is formed in parallel to the outer peripheral surface of the rotating axis 1. An annular discharge restraining part 54 is formed in the runner 50 to protrude to the outside of the radial direction towards the inner peripheral surface of the bearing bracket 20.