An ink jet head has a plurality of first ink chambers (3) front end portions of which open at an end surface (A) of the substrate and rear end portions of which are blocked, and a plurality of second ink chambers (4) front end portions of which open at an end surface (B) on the opposite side to the end surface (A) and rear end portions of which are blocked. Furthermore, this ink jet head has electrodes formed upon inner walls of the first ink chambers (3) and the second ink chambers (4), a first common ink chamber (6) formed between the rear end portions of the second ink chambers (4) and the end surface (A) and communicated with the first ink chambers (3), and a second common ink chamber (7) formed between the rear end portions of the first ink chambers (3) and the end surface (B) and communicated with the second ink chambers (4). And this ink jet head has a nozzle plate covering the first ink chambers (3) and the second ink chambers (4), and having nozzle holes formed to correspond to those ink chambers.