In order to manufacture an ink-jet head, a head body and a reservoir unit are formed first. Then, UV-cured resin is applied on the lower surface of the reservoir unit. Then, the head body is placed on a plane of a jig so that the plane abuts against the ink discharge surface. Then, the reservoir unit is positioned with respect to the head body and the jig so that an ink reservoir of the reservoir unit and ink flow channels of a flow channel unit are brought into communication and the both ends in the longitudinal direction of a reservoir base plate and the upper surfaces of walls oppose to each other, and the reservoir unit is laminated on upper surface of the flow channel unit via the UV-cured resin. Subsequently, the UV-cured resin is cured in a state in which the lower surface of the reservoir base plate abuts against the upper surfaces of the walls.