Provided is an alignment apparatus for a liquid-jet head which includes a nozzle plate, a fixation member, a transparent mask, chucks, and an alignment mechanism. The nozzle plate includes a nozzle orifice for injecting a liquid for the liquid-jet head, and a first and a second alignment marks to be used in an aligning operation. Each of the alignment marks is formed in each of two end portions in the longitudinal direction of the nozzle plate. The fixation member holds the nozzle-plate side of each of a plurality of liquid-jet heads. The fixation member and the nozzle plate are positioned relative to each other and joined together by use of the alignment apparatus for the liquid-jet head. The transparent mask includes a first and a second reference marks with which the first and the second alignment marks are to be aligned respectively. The chucks are brought into contact respectively with two end surfaces in the longitudinal direction of each liquid-jet head, and thus hold the liquid-jet head. The alignment mechanism is configured to move the liquid-jet head by use of the chucks linearly within a plane that is parallel to the nozzle plate, and to move the liquid-jet head rotationally about an axis orthogonal to the plane.