An ink-jet head including: a passage unit in which formed are a common ink chamber and a plurality of individual ink passages each extending from an outlet of the common ink chamber through a pressure chamber to an ink ejection port; and a plurality of actuator units that are fixed to a plane defined by a surface of the passage unit and give ejection energy to ink in each pressure chamber, the plurality of actuator units having the same shape, wherein a plurality of closed passages (14, 55) each having a shape of the individual ink passage and not communicating with the common ink chamber are formed in the passage unit, when a plurality of the ink ejection ports corresponding to a plurality of the pressure chambers are projected in a direction perpendicular to an imaginary line that is parallel to the plane, their projective points onto the imaginary line align at regular intervals; and the plurality of individual ink passages are regularly formed in active regions (19a, 19b), each active region being enclosed by a contour of corresponding one of the actuator units in a plan view and in addition the plurality of active regions (19a, 19b) being located between both ends, with respect to a direction of the imaginary line, defined by positions of the two projective points located outermost on the imaginary line; wherein the plurality of closed passages (14, 55) are arranged in outer regions, each outer region being enclosed by the contour of corresponding one of the two outermost actuator units in a plan view and in addition the outer regions being located outside the active regions (19a, 19b) with respect to the direction of the imaginary line, in the same pattern as that of the plurality of individual ink passages in the active regions (19a, 19b), wherein the plurality of individual ink passages are arranged into a plurality of individual ink passage rows extending in a first arrangement direction, wherein the imaginary line extends in the first arrangement direction, and characterised in that only the plurality of closed passages (14, 55) are arranged in the outer regions, wherein each boundary between the outermost active regions and the two outer regions exists at a boundary between where a length of the actuator unit intercepted by an imaginary plane (K1, K2) that is perpendicular to the imaginary line is constant regardless of a position of the imaginary plane and where the length varies as the imaginary plane (K1, K2) is displaced. a passage unit in which formed are a common ink chamber and a plurality of individual ink passages each extending from an outlet of the common ink chamber through a pressure chamber to an ink ejection port; and a plurality of actuator units that are fixed to a plane defined by a surface of the passage unit and give ejection energy to ink in each pressure chamber, the plurality of actuator units having the same shape, wherein a plurality of closed passages (14, 55) each having a shape of the individual ink passage and not communicating with the common ink chamber are formed in the passage unit, when a plurality of the ink ejection ports corresponding to a plurality of the pressure chambers are projected in a direction perpendicular to an imaginary line that is parallel to the plane, their projective points onto the imaginary line align at regular intervals; and the plurality of individual ink passages are regularly formed in active regions (19a, 19b), each active region being enclosed by a contour of corresponding one of the actuator units in a plan view and in addition the plurality of active regions (19a, 19b) being located between both ends, with respect to a direction of the imaginary line, defined by positions of the two projective points located outermost on the imaginary line; wherein the plurality of closed passages (14, 55) are arranged in outer regions, each outer region being enclosed by the contour of corresponding one of the two outermost actuator units in a plan view and in addition the outer regions being located outside the active regions (19a, 19b) with respect to the direction of the imaginary line, in the same pattern as that of the plurality of individual ink passages in the active regions (19a, 19b), wherein the plurality of individual ink passages are arranged into a plurality of individual ink passage rows extending in a first arrangement direction, wherein the imaginary line extends in the first arrangement direction, and characterised in that only the plurality of closed passages (14, 55) are arranged in the outer regions, wherein each boundary between the outermost active regions and the two outer regions exists at a boundary between where a length of the actuator unit intercepted by an imaginary plane (K1, K2) that is perpendicular to the imaginary line is constant regardless of a position of the imaginary plane and where the length varies as the imaginary plane (K1, K2) is displaced.