PROBLEM TO BE SOLVED: To prolong a service life by dispersing stress concentrated on the key slot part of a thin roller member, and preventing the occurrence of a break or crack on an edge part of the key slot part. ;SOLUTION: This roller shape member is composed of a hollow core member 10 consisting of such as a thin metal, and the key member 11 made of heat resistant insulation member fitted to its end part. The key member 11 is composed in the external size permitting the core material 10 to be inserted in inside without any gap. The key member 11 is inserted so that the key 14 is matched with the key groove 13 of the core material 10, and a rotary driving gear 12 is fitted outside the core material 10 so that the key groove 15 is matched with the key 14 projecting over a periphery of the core material 10. The force applied to the core material 10 by the key 14 when the rotary driving gear 12 is rotated by the external force, on the rear side in the rotary direction, since there is no gap between the core material 10 and the key member 11, is applied in the direction for pushing up the core material 10 outward in the shaft direction dispersed to the inside surface of the core material 10, and thus deformation on the key groove 13 part is prevented from occurring.;COPYRIGHT: (C)1998,JPO
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