An ink-jet head according to the present invention includes a wire member and a heat sink. The wire member has a substrate on a surface of which a driver IC chip is mounted. The heat sink is made of a metal material, in contact with the driver IC chip, and dissipates heat generated in the driver IC chip to outside. A first wire and a second wire are formed on the surface of the substrate of the wire member. The first and second wires are electrically connected to an individual electrode and a common electrode of a piezoelectric actuator, respectively. The second wire is formed along an outer edge of the substrate, and electrically connected and thermally coupled to the heat sink.