To prevent the random coil of a wire rope, and to reduce the installation space.

A sheave 22 around which a wire rope 4 is wound is turnably supported by sheave support body 23. A guide ball 26, a holding fitting 25, a spring 28, and a magnet part 27 are arranged on the outer circumference of a support ring 24 fixed to a lower part of the sheave support body 23. When the wire rope 4 is wound up or unwounded, the holding fitting 25 is attracted to the magnet part 27 side by the magnet part 27, and the support ring 24, in its turn, the sheave support body 23 is permitted to turn and the direction of he sheave 22 is changed. When the wire rope 4 is neither wound up nor unwound, the magnet part 27 is in the non-excited condition, and the holding fitting 25 and the guide ball 26 are pressed against the inner circumferential side by a spring 28, and the support ring 24, in its turn, the sheave support body 23 is restricted in the turn, and the direction of the sheave 22 is fixed.