An air jet loom comprising: a reed holder to which a reed is attached and which is supported by a rocking shaft with a plurality of sley swords provided between the reed holder and the rocking shaft; a plurality of sub-nozzles provided on the reed holder and arranged side by side along a weft traveling path; a compressed air tank that stores compressed air to be ejected from the sub-nozzles during weft insertion; a plurality of electromagnetic on-off valves, each of which is provided so as to correspond to one or more of the sub-nozzles and connected to the compressed air tank, the electromagnetic on-off valves controlling supply of the compressed air to the corresponding sub-nozzles; a plurality of fluid supply tubes, each of which is provided so as to correspond to one of the sub-nozzles and supplies the compressed air to the corresponding sub-nozzle, the fluid supply tubes being flexible and connecting supply-side tube joints to introduction ends of air introduction portions of the sub-nozzles, the supply-side tube joints being attached to the electromagnetic on-off valves directly or indirectly with a channel-forming member provided between the supply-side tube joints and the electromagnetic on-off valves; and a beam member for supporting the electromagnetic on-off valves, the beam member being fixed so as to extend in a width direction of the loom, characterised in that the loom further comprises a support structure including a support stay provided so as to extend in a front-rear direction of the loom, one end of the support stay in the front-rear direction being attached to the beam member and other end of the support stay in the front-rear direction supporting the electromagnetic on-off valves, and in that the electromagnetic on-off valves are supported by the support structure so that, when viewed in the width direction, connecting portions of the supply-side tube joints that are connected to the fluid supply tubes are at least partially located within a swing range in which a line segment (Ta) swings as the reed holder swings, the line segment (Ta) connecting a center of the rocking shaft to a center of the introduction end of each sub-nozzle when viewed in the width direction. a reed holder to which a reed is attached and which is supported by a rocking shaft with a plurality of sley swords provided between the reed holder and the rocking shaft; a plurality of sub-nozzles provided on the reed holder and arranged side by side along a weft traveling path; a compressed air tank that stores compressed air to be ejected from the sub-nozzles during weft insertion; a plurality of electromagnetic on-off valves, each of which is provided so as to correspond to one or more of the sub-nozzles and connected to the compressed air tank, the electromagnetic on-off valves controlling supply of the compressed air to the corresponding sub-nozzles; a plurality of fluid supply tubes, each of which is provided so as to correspond to one of the sub-nozzles and supplies the compressed air to the corresponding sub-nozzle, the fluid supply tubes being flexible and connecting supply-side tube joints to introduction ends of air introduction portions of the sub-nozzles, the supply-side tube joints being attached to the electromagnetic on-off valves directly or indirectly with a channel-forming member provided between the supply-side tube joints and the electromagnetic on-off valves; and a beam member for supporting the electromagnetic on-off valves, the beam member being fixed so as to extend in a width direction of the loom, characterised in that the loom further comprises a support structure including a support stay provided so as to extend in a front-rear direction of the loom, one end of the support stay in the front-rear direction being attached to the beam member and other end of the support stay in the front-rear direction supporting the electromagnetic on-off valves, and in that the electromagnetic on-off valves are supported by the support structure so that, when viewed in the width direction, connecting portions of the supply-side tube joints that are connected to the fluid supply tubes are at least partially located within a swing range in which a line segment (Ta) swings as the reed holder swings, the line segment (Ta) connecting a center of the rocking shaft to a center of the introduction end of each sub-nozzle when viewed in the width direction.