A heating drum, which guides a long-sized medium and also heats and dries the medium, comprising: a cylinder shaped main body part; disc-shaped limb parts attached to the two end parts of the main body part; and a shaft core attached to the limb part, characterized in that on the edges of the two end parts of the inner circumferential surface of the main body part, cut-out parts that extends in the circumferential direction are formed, respectively, and a groove part that extends in the circumferential direction is formed on the inner circumferential surface on the inner side from the cut-out part of the main body part, and the longitudinal direction of the cut-out part and the longitudinal direction of the groove part are in parallel with each other, and the limb part is fitted to the cut-out part, with a claw part being fixed to the limb part by a fitting tool, so that a hook part of the claw part is freely movably fitted to the groove part, and that on the edge parts of the two end parts of the inner circumferential surface of the main body part, cut-out parts with a narrow width, which extends in the circumferential direction, are formed, respectively, and the cut-out part and the narrow-width cut-out part are alternately disposed, with the width of the narrow-width cut-out part being set to be smaller than the width of the cut-out part, and a plurality of cut-out parts on the limb side are formed on the limb part with a predetermined interval so that an end part of the limb part with no limb-side cut-out part being formed thereon is fitted to the cut-out part, with an end part (21, 22) of the limb part with the limb-side cut-out part being formed thereon being fitted to the narrow-width cut-out part. a cylinder shaped main body part; disc-shaped limb parts attached to the two end parts of the main body part; and a shaft core attached to the limb part, characterized in that on the edges of the two end parts of the inner circumferential surface of the main body part, cut-out parts that extends in the circumferential direction are formed, respectively, and a groove part that extends in the circumferential direction is formed on the inner circumferential surface on the inner side from the cut-out part of the main body part, and the longitudinal direction of the cut-out part and the longitudinal direction of the groove part are in parallel with each other, and the limb part is fitted to the cut-out part, with a claw part being fixed to the limb part by a fitting tool, so that a hook part of the claw part is freely movably fitted to the groove part, and that on the edge parts of the two end parts of the inner circumferential surface of the main body part, cut-out parts with a narrow width, which extends in the circumferential direction, are formed, respectively, and the cut-out part and the narrow-width cut-out part are alternately disposed, with the width of the narrow-width cut-out part being set to be smaller than the width of the cut-out part, and a plurality of cut-out parts on the limb side are formed on the limb part with a predetermined interval so that an end part of the limb part with no limb-side cut-out part being formed thereon is fitted to the cut-out part, with an end part (21, 22) of the limb part with the limb-side cut-out part being formed thereon being fitted to the narrow-width cut-out part.