An ink jet head is constituted by a recording element substrate comprising an energy generating element; and an electric wiring member on which a plurality of flying leads electrically connected to said recording element substrate by thermocompression bonding through gang bonding is arranged in parallel. The ink jet head further includes a plurality of thermocompression bonding portions, formed on the plurality of flying leads by the thermocompression bonding, including thermocompression bonding portions formed on at least both end flying leads with respect to an arrangement direction of the plurality of flying leads. The thermocompression bonding portions formed on the above-described at least both end flying leads are offset toward a center of the plurality of flying leads with respect to the arrangement direction.