liquid jet head which includes etching a rolled metal plate based on a rolling direction of the rolled metal plate to form an etched portion and a non etched portion on the rolled metal plate the thickness of the etched portion is thinner than the thickness of the non etched portion and the rolling direction is substantially perpendicular to a long side of the rolled metal plate application_number US 13708108 A description hereinafter the invention will be described in detail with reference to illustrated embodiments fig1 shows an embodiment of the ink jet recording head of the invention the ink jet recording head is configured by integrally fixing a channel unit 1 and a piezoelectric vibrator unit 2 via a head holder 3 the channel unit 1 is configured by laminating a nozzle plate 4 a channel forming substrate 5 and a plate member 6 pressure generating chambers 8 are contracted and expanded by expansion and contraction of respective piezoelectric vibrators 7 of the piezoelectric vibrator unit 2 thereby ejecting ink droplets the nozzle plate 4 is formed with nozzle openings 9 which respectively communicate with the pressure generating chambers 8 and the channel forming substrate 5 is formed with the pressure generating chambers 8 ink supply ports 10 and reservoirs 11 in this embodiment a common reservoir 11 is provided for each row of the pressure generating chambers 8 and ink supply ports 10 are provided to communicates the common reservoir 11 with the corresponding row of.