A method for manufacturing a cartridge which contains a printing material to be supplied to a printing device, the method comprising: a step (a) of preparing a cartridge which has a printing material containing chamber for containing the printing material, and first and second printing material supply sections which supply the printing material contained in the printing material containing chamber to the printing device, the printing material containing chamber including a main containing chamber, a sub containing chamber which branches the printing material contained in the main containing chamber so as to the printing material flows into the first and second printing material supply sections, a first port through which the printing material contained in the main containing chamber flows into the sub containing chamber, a second port through which the printing material contained in the sub containing chamber flows into the first printing material supply section, and a third port through which the printing material contained in the sub containing chamber flows into the second printing material supply section, the sub containing chamber including a first sub containing chamber in which the first port is provided, a second sub containing chamber in which the second port is provided, and a third sub containing chamber in which the third port is provided, and the cartridge further including a first film member which is provided on a +Y axial direction side of the cartridge and forms side surfaces on the +Y axial direction side of the main containing chamber, the first sub containing chamber, and the second sub containing chamber, respectively, a second film member which is provided on a -Y axial direction side of the cartridge and forms side surfaces on the -Y axial direction side of the first sub containing chamber and the third sub containing chamber, respectively, and a lid member which is provided to cover the second film member; a step (b) of exposing at least a portion of the second film member; a step (c) of filling the printing material into the sub containing chamber by creating a hole in the second film member so as to cause the printing material to be contained in the printing material containing chamber after the step (b); and a step (d) of closing the hole after the step (c). a step (a) of preparing a cartridge which has a printing material containing chamber for containing the printing material, and first and second printing material supply sections which supply the printing material contained in the printing material containing chamber to the printing device, the printing material containing chamber including a main containing chamber, a sub containing chamber which branches the printing material contained in the main containing chamber so as to the printing material flows into the first and second printing material supply sections, a first port through which the printing material contained in the main containing chamber flows into the sub containing chamber, a second port through which the printing material contained in the sub containing chamber flows into the first printing material supply section, and a third port through which the printing material contained in the sub containing chamber flows into the second printing material supply section, the sub containing chamber including a first sub containing chamber in which the first port is provided, a second sub containing chamber in which the second port is provided, and a third sub containing chamber in which the third port is provided, and the cartridge further including a first film member which is provided on a +Y axial direction side of the cartridge and forms side surfaces on the +Y axial direction side of the main containing chamber, the first sub containing chamber, and the second sub containing chamber, respectively, a second film member which is provided on a -Y axial direction side of the cartridge and forms side surfaces on the -Y axial direction side of the first sub containing chamber and the third sub containing chamber, respectively, and a lid member which is provided to cover the second film member; a step (b) of exposing at least a portion of the second film member; a step (c) of filling the printing material into the sub containing chamber by creating a hole in the second film member so as to cause the printing material to be contained in the printing material containing chamber after the step (b); and a step (d) of closing the hole after the step (c).