While the material for these plates 38, 40, 42 of the ink nozzle member 32 is not particularly limited, these plates 38, 40, 42 are preferably made of a plastic or a metal such as nickel or stainless steel, which permits the nozzles 44 and orifices 48 to be formed in the respective nozzle and orifice plates 38, 40 with high accuracy.