To provide a weft-inserting device capable of easily setting a position where a giving rapier head and a receiving rapier head meet with each other.

This device is formed by disposing a lot of support pieces 21 and 21A along the longitudinal direction of a sleigh 20 in front of the sleigh 20 supporting a set of dents 19, by setting a sending rapier head 15 designed to be inserted into openings for warps T while grasping wefts Y so as to travel on the line of the support pieces 21 and 21A, by similarly setting a receiving rapier head 16 designed to receive the wefts Y from the rapier head 15 and to retreat from the openings for the warps T so as to travel on the same line, by adding a colored fiducial sign 211 to the surface of one 21A of the support pieces 21 and 21A, and by placing the supporting piece 21A in an intermediate portion between both rapier wheels 13 and 14.