To assemble an ink channel part including an ink chamber without using adhesive.

The ink jet head comprises a top plate 12 having recesses to become an ink chamber 20 for containing ink and an ink supply passage 22 for supplying the ink to the chamber 20 and a nozzle 26 for discharging the ink in the chamber 20 and formed by etching and made of a conductive material, and a partition wall 14 provide to cover a recess forming surface of the plate 12 and made of a conductive material. In this case, the plate 12 and wall 14 are adhered by energizing between both the materials 12 and 14 while heating them in the state that they are pressed to each other.