To prevent concentration of tension to one point of weft and to prevent a damage such as crack, loosening, breaking or fuzzing of weft.

This weft tension controller 2 in a fluid jetting type loom 1 has a weft stopper 10 between a yarn guide 6 at prescribed position disposed in front of the weft inserting direction of a length measuring and storing device 5 and a weft inserting nozzle 7 disposed in a slay 8, and stops a transfer of the weft 3 according to a progressing motion of the slay 8 with the weft stopper 10, then bends the weft 3 to impart a tension suitable for the weft. In the weft tension controller 2, a plurality of stoppers 11 and 12 are arranged on the weft stopper 10 in separating to the weft inserting direction.