Ink-jet head and ink-jet printer

An ink-jet head comprises a passage unit (304) including pressure chambers (310) each having one end connected with a nozzle (308) and the other end to be connected with an ink supply source. The pressure chambers are arranged along a plane to neighbor each other. The ink-jet head further comprises actuator units (321) fixed to a surface of the passage unit for changing the volume of each pressure chamber. Each actuator unit includes pressure generation portions respectively corresponding to pressure chambers, and is formed to extend along the pressure chambers. The actuator unit having a substantially regular hexagonal profile with five of more straight sides (L1-L6) connected at one of a right angle or an obtuse angle.