To provide a water pump and a bearing thereof, which can prevent the adhesion phenomenon between the bearing and a washer to reduce the friction and wear therebetween, thereby enhancing the performance of the water pump and prolonging the lifetime of the bearing.

This bearing 341 of the water pump 3 is used together with the washer 30. The bearing has a substantially columnar body, and a shaft hole is arranged in the center of the body. At least one chipped port 3414 for forming a water film is arranged on the end surface 3413 corresponding to the washer of the body.