To provide a device capable of properly removing a place polluted by a toxic substance such as dioxins, without generating a large quantity of grinding/polishing/cleaning materials and separation materials polluted by the toxic substance such as the dioxins.

This rotary brush device has a rotary means 1 for rotating a rotary brush body, the rotatably constituted rotary brush body 2 detachably installed on a rotary shaft of the rotary means 1, a surrounding means 4 installed in the rotary means 1, capable of surrounding the rotary brush body 2 with a processing object surface and having a ventilation means 3, and a sucking means connected to the surrounding means 4 via a flexible conduit and sucking from the inside of the surrounding means 4.