To provide an upper part water supply type floor brush not allowing splash of washing water from the whole periphery of the rotating brush even if washing a floor face while continuously supplying the washing water to an upper part of the floor brush rotating at a high speed.

This upper part water supply type floor brush 1 washes the floor face while supplying the washing water to the upper part of the rotating floor brush. In the floor brush 1, the periphery of an installation hole 9 to a rotary disk formed in the center of the upper part 2 of the toroidal floor brush 1 is circularly formed with a groove 3 receiving the water supply of the washing water, a vertical face 4 of an outer frame of the groove 3 is properly formed with lateral holes 5, and the tip 6 of each the lateral hole 5 is formed with a vertical pipe 8 communicating with the tip 7 of the brush 1.