A device body comprises: a winding roller that is provided so as to contact with a flooring material sheet bonded to a floor and on which is wound the sheet that is stripped from the floor starting from a contact portion with the sheet; a driving means that, by rotationally driving the winding roller, winds the sheet onto the winding roller and strips the same from the floor, and that advances the device body by the winding roller being pushed toward the floor by the reactive force of the removal and rolling on the sheet; and a guiding means that discharges the sheet being stripped from the floor in front of or to the side of the direction of advancement of the device body.