To provide the subject relaxation device intended for stable tuck-in operations without increasing air consumption or weft consumption in a multiple- tucking loom.

In a multiple-tucking loom having at least one tuck-in device situated within a weave width region and an air jet nozzle positionally fixed with respect to a reed and intended for generating air jet for bending a picked weft at a position against the tuck-in device, there is also provided a means for changing the jetting condition of the above air jet nozzle in response to the changeover of weaving conditions during weaving operations.