An air-jet loom comprising: a main nozzle that injects a weft yarn into a weft insertion passage; a plurality of sub-nozzles that is arranged along the weft insertion passage and from which air is jetted; and an air tank that is connected to the plurality of the sub-nozzles and reserves air therein, wherein the plurality of the sub-nozzles includes: a first sub-nozzle from which air is jetted into a high air-pressure zone of the weft insertion passage; and a second sub-nozzle from which air is jetted into a low air-pressure zone of the weft insertion passage, a first hose is provided between the first sub-nozzle and the air tank, a second hose is provided between the second sub-nozzle and the air tank, and a flow resistance in a first air passage between the first sub-nozzle and the air tank is lower than a flow resistance in a second air passage between the second sub-nozzle and the air tank, characterized in that a first sleeve is fitted into an end portion of the first hose on the air tank side, a second sleeve is fitted into an end portion of the second hose on the air tank side, and an internal diameter of the second sleeve is smaller than an internal diameter of the first sleeve to change the flow resistance, or roughness of an inner surface of the second hose is higher than roughness of an inner surface of the first hose to change the flow resistance, or an inner surface area of the second hose is wider than an inner surface area of the first hose to change the flow resistance, or a length of the second hose is greater than a length of the first hose to change the flow resistance. a main nozzle that injects a weft yarn into a weft insertion passage; a plurality of sub-nozzles that is arranged along the weft insertion passage and from which air is jetted; and an air tank that is connected to the plurality of the sub-nozzles and reserves air therein, wherein the plurality of the sub-nozzles includes: a first sub-nozzle from which air is jetted into a high air-pressure zone of the weft insertion passage; and a second sub-nozzle from which air is jetted into a low air-pressure zone of the weft insertion passage, a first sub-nozzle from which air is jetted into a high air-pressure zone of the weft insertion passage; and a second sub-nozzle from which air is jetted into a low air-pressure zone of the weft insertion passage, a first hose is provided between the first sub-nozzle and the air tank, a second hose is provided between the second sub-nozzle and the air tank, and a flow resistance in a first air passage between the first sub-nozzle and the air tank is lower than a flow resistance in a second air passage between the second sub-nozzle and the air tank, characterized in that a first sleeve is fitted into an end portion of the first hose on the air tank side, a second sleeve is fitted into an end portion of the second hose on the air tank side, and an internal diameter of the second sleeve is smaller than an internal diameter of the first sleeve to change the flow resistance, or roughness of an inner surface of the second hose is higher than roughness of an inner surface of the first hose to change the flow resistance, or an inner surface area of the second hose is wider than an inner surface area of the first hose to change the flow resistance, or a length of the second hose is greater than a length of the first hose to change the flow resistance.