PURPOSE: To prevent the damage to a long-sized material to be heated itself and dislocation of the bonding position by providing a rotary support in the axial direction of the material and placing the material on the support.

CONSTITUTION: First and second protrusions 2 and 3 are formed on both ends of a plate support 1, and first and second receivers 2a and 3a for first and second rollers 4a and 4b are respectively formed on the protrusions 2 and 3. The rollers 4a and 4b have a furrowed recess 5 with the center circularly cut when seen in direction of the arrow B2, and a shaft 61 placed thereon is not tumbled down. A third protrusion 6 is formed at the center (L1=L2) of the support 1, and a stationary supporting plate 7 is erected. When a long-sized material 60 is heated under these conditions, the left and right ends of the shaft 61 extend outward, hence the rollers 4a and 4b are rotated, however the fixing and supporting position at the center is not dislocated since the frictional resistance of the roller is small, and the rollers 4a and 4b and shaft 61 are not damaged.