To improve the working efficiency by realizing a simple and correct assembly work, to facilitate the alignment of a shaft hole to eliminate any defective winding of a wire, and to prevent any idling of a reel shaft to eliminate any changes in the tension of the wire to be delivered.

In a reel A, a reinforcement disk 3 having a plurality of holes 3e for kelly pins are provided on both ends of a barrel part 1, and the reel shaft 4 is provided inside the barrel part 1. A pair of positioning marks 3c are provided in a circumferential part of the reinforcement disk 3 and a part of the flange. At least two female and male fitting parts 2d and 3d are provided at equal intervals on an abutting surface between the flange 2 and the reinforcement disk 3.