Ink jet head

An ink jet head for discharging ink by a pressure change caused by boiling the ink, said ink jet head comprising:

• a substrate provided with, in an array arrangement, a plurality of heat generating elements for generating the pressure change;
• and
• a plurality of ink flow paths, which respectively communicate with discharge ports, for supplying the ink,
• wherein said ink flow paths have a ceiling provided with the discharge ports and a plurality of partition walls contacting said substrate and said ceiling to form bent portions,
• wherein between each pair of wall surfaces constituting said ink flow paths, two or more of said plurality of heat generating elements are provided in a direction in which said wall surfaces are opposed to each other, and
• wherein in each ink flow path, in a direction in which said two or more heat generating elements are arranged, an interval between each of the partition walls and the heat generating element adjacent to the respective partition wall is equal to or less than 4 μm.