To obtain an air jet loom capable of improving weaving efficient and quality of woven fabric by providing an auxiliary nozzle having a specific structure separately from a main nozzle for running weft.

An auxiliary nozzle 1 for jetting air having a velocity component in running direction of weft and a velocity component in the direction moving toward a reed 4 is provided separately from a main nozzle for running the weft. Furthermore, it is preferable that the auxiliary nozzle 1 is provided parallel to the main nozzle 2 and formed in a shape of a straight pipe to a position separated by 2-3 cm from the top and jetting direction of the auxiliary nozzle 1 is made to coincide with a direction coinciding with jetting direction of the main nozzle 2 and a direction in which a reed arranges or the auxiliary nozzle 1 is installed at an angle of 0-30 degree in direction in which reed arranges to the main nozzle 2 and weaving is preferably carried out by using the air jet loom.