To provide a method for installing a fireproof treatment tool with which the fireproof treatment tool can be deposited easily on an outer surface of pipeline/piping material inserted into a penetration part, and the fireproof treatment tool.

A fireproof treatment tool 11 comprises a viscous layer 13 constituted of a viscous material and a pressing layer 12 constituted of a thermally expandable heat-resistant rubber, and a net body 14 is deposited on the viscous layer 13. When installing the fireproof treatment tool 11, first of all, the fireproof treatment tool 11 is wound while confronting the net body 14 to an outer surface of a corrugated tube S outside of a through-hole Wa, the fireproof treatment tool 11 is moved in an axial direction of the corrugated tube S and disposed between the through-hole Wa and the corrugated tube S. Then, the fireproof treatment tool 11 is pressed toward the corrugated tube S and the net body 14 is merged within the viscous layer 13, thereby moving the viscous layer 13 passing through meshes forward further than the net body 14 and the viscous layer 13 is deposited to the corrugated tube S.