An ink-jet head comprising: a head chip (1;1') in which a plurality of channel rows (A-C) each having channels (11A-C,12A-C) and drive walls (13A,13B) formed of piezoelectric elements alternately arranged therein and also having drive electrodes formed on the drive walls (13A,13B) each facing the inside of the respective channel (11A-C,12A-C) are arranged, opening portions (120A,120B) of the channels (11A-C,12A-C) are arranged in each of a front face and a rear face, connection electrodes (15A,15B) electrically conductive with respect to the drive electrodes in the channels (11A-C,12A-C) are formed on the rear face, and each channel row (A-C) is configured by alternately arranging drive channels (11A-C) from which an ink is to be discharged and dummy channels (12A-C) from which the ink is not to be discharged; and a wiring substrate (3;3') that is attached to the rear face of the head chip (1;1') so as to cover the plurality of channel rows (A-C) and protrude toward a lateral side of the head chip (1;1'), wherein each of the connection electrodes (15A-C) is electrically drawn to an end portion of the wiring substrate (3;3') by electrically connecting wiring electrodes formed on a surface of the wiring substrate (3;3') at which the wiring substrate (3;3') is attached to the head chip (1;1') with the connection electrodes (15A,15B), wherein ink in the drive channels (11A-C) is adapted to be discharged from nozzles by applying a voltage to the drive electrodes through the wiring electrodes and the connection electrodes (15A,15B), wherein, in the wiring substrate (3;3'), each through-hole (32A-C) for ink supply is formed only at a position corresponding to the opening portion (120A,120B) of each drive channel (11A-C), at least one wiring electrode runs between the through-holes (32A-C) adjacent to each other in at least one through-hole row of a plurality of through-hole rows associated with the channel rows (A-C) and extends to the end portion of the wiring substrate (3;3') protruding toward the lateral side of the head chip (1;1'), and wherein a gap is formed between the rear face of the head chip (1;1') and the substrate (3;3') so that the surface of the wiring electrode is apart from the rear face of the head chip (1;1') and so that at least one wiring electrode running between the through-holes (32A-C) is not in contact with the opening portion (120A,120B) of the dummy channel (12A-C) and overlaps the opening portion (120A,120B) of the dummy channel (12A-C) as seen from an ink discharge direction. a head chip (1;1') in which a plurality of channel rows (A-C) each having channels (11A-C,12A-C) and drive walls (13A,13B) formed of piezoelectric elements alternately arranged therein and also having drive electrodes formed on the drive walls (13A,13B) each facing the inside of the respective channel (11A-C,12A-C) are arranged, opening portions (120A,120B) of the channels (11A-C,12A-C) are arranged in each of a front face and a rear face, connection electrodes (15A,15B) electrically conductive with respect to the drive electrodes in the channels (11A-C,12A-C) are formed on the rear face, and each channel row (A-C) is configured by alternately arranging drive channels (11A-C) from which an ink is to be discharged and dummy channels (12A-C) from which the ink is not to be discharged; and a wiring substrate (3;3') that is attached to the rear face of the head chip (1;1') so as to cover the plurality of channel rows (A-C) and protrude toward a lateral side of the head chip (1;1'), wherein each of the connection electrodes (15A-C) is electrically drawn to an end portion of the wiring substrate (3;3') by electrically connecting wiring electrodes formed on a surface of the wiring substrate (3;3') at which the wiring substrate (3;3') is attached to the head chip (1;1') with the connection electrodes (15A,15B), wherein ink in the drive channels (11A-C) is adapted to be discharged from nozzles by applying a voltage to the drive electrodes through the wiring electrodes and the connection electrodes (15A,15B), wherein, in the wiring substrate (3;3'), each through-hole (32A-C) for ink supply is formed only at a position corresponding to the opening portion (120A,120B) of each drive channel (11A-C), at least one wiring electrode runs between the through-holes (32A-C) adjacent to each other in at least one through-hole row of a plurality of through-hole rows associated with the channel rows (A-C) and extends to the end portion of the wiring substrate (3;3') protruding toward the lateral side of the head chip (1;1'), and wherein a gap is formed between the rear face of the head chip (1;1') and the substrate (3;3') so that the surface of the wiring electrode is apart from the rear face of the head chip (1;1') and so that at least one wiring electrode running between the through-holes (32A-C) is not in contact with the opening portion (120A,120B) of the dummy channel (12A-C) and overlaps the opening portion (120A,120B) of the dummy channel (12A-C) as seen from an ink discharge direction.