To provide an economical cup type rotary brush capable of polishing down to a terminal part of a brush bundle, reducing an amount of disposal even when disposing it, and reducing waste of resources and waste.

In this cup type rotary brush composed of a cup type base 2, the brush bundle 4 which is cut to a predetermined length and whose terminal part only is fixed to the base 2 in a condition in which it is aligned along an inner peripheral face of the base 2, and a skirt 3 made of rubber or synthetic resin material and fixed to the base to prevent that the brush bundle 4 is opened and enlarged toward outer periphery by centrifugal force, abrasive grains 10 having a polishing force is mixed in the skirt 3.