A guide-pulley device is equipped with: a guide pulley having a plurality of grooves configured so as to independently accommodate two cables for moving in a manner such that when one moves in a winding direction, the other moves in a feeding direction; and a storage body for storing the guide pulley. The storage body has first and second storage members which attach to one another. The first storage member has a base on which a support shaft for supporting the guide pulley stands upright. The second storage member has a lid section which faces the base section. The first storage member also has a partition wall for forming two routing channels for routing each of the cables, and a plurality of hooks projecting from the partition into the grooves. The base, the partition wall, and the hooks are formed integrally.