To provide a braid-like yarn having a special structure and used for weaving, to provide a seamless cylindrical structure (especially seamless belt) using the yarn, and especially to provide a seamless belt whose meander or slipping-out can efficiently be prevented, when wound up between crown shape-like pulleys.

This yarn for weaving, characterized by comprising a braid-like yarn (2) having a structure obtained by integrally twisting plural peripheral yarns (2b) on core yarns (2a) comprising elastic yarns. The seamless cylindrical structure, especially a seamless belt, obtained by using the braid-like yarns (2) at least as a part of at least longitudinally directed yarns (11) among the longitudinally directed yarns (11) and laterally directed yarns (12) to weave the seamless woven fabric (1).