The roller members (40) are provided with: a bearing part (41) affixed to a device main body (5a); an elastic roller part (42) that is disposed having a gap (D) with the outside peripheral surface of the hot roller (27) and with which an end part (26a) of the anchoring belt (26) comes into contact because of the meandering of the anchoring belt (26); and a powder (43) that is disposed between the bearing part (41) and the elastic roller part (42) and restricts the rotation of the elastic roller part (42). The gap (D) is constituted smaller than the thickness (T) of the anchoring belt (26) and the end part (26a) of the anchoring belt (26) enters the gap in opposition to the elastic force of the elastic roller part (42) because of the meandering of the anchoring belt (26).