Ink channel unit

An ink channel unit (140) usable in an ink cartridge (100) and a method of manufacturing the same. After preparing a plurality of channel plates formed with ink channels through which ink passes, the plurality of channel plates (141,142,143) are arranged and layered, and at least one adhesive sheet (161,162) having a substantially uniform thickness is disposed between the plurality of channel plates (141,142,143). Then, the plurality of channel plates (141,142,143) and the at least one adhesive sheet (161,162) are pressed and heated at a given temperature to cure the adhesive sheet (161,162), thereby adhering the channel plates together (141,142,143). The adhesive sheet (161,162) includes a base layer (161a,162a) and adhesive layers (161b,161c,162b,162c) formed on both surfaces of the base layer (161a,162a), and the adhesive layer (161b,161c,162b,162c) is made of an epoxy resin. The manufacturing of the ink channel unit (140) is simplified and a time required to manufacture the ink channel unit (140) is shortened, thereby increasing productivity.