Patent ID: 7073884

Claim:
An ink jet head comprising: a nozzle chip with a thin substantially rectangular parallelepiped plate shape, including: a front end surface in which a plurality of nozzles for jetting ink are provided, a back end surface opposed to the front end surface, which has a substantially rectangular shape with a pair of short sides each having a length substantially equal to a thickness of the substantially rectangular parallelepiped platte, and four side surfaces adjacent to the back end surface; and a frame shape member, to position and mount the nozzle chip thereon, including: a first protrusion pair which abuts on one pair of facing side surfaces extending in a lengthwise direction, of the four side surfaces, at positions in the vicinity of an end of the back end surface of the nozzle chip in a lengthwise direction to sandwich the nozzle chip, and a second protrusion pair which abuts on the other pair of facing sides surfaces of the nozzle chip, extending in a thickness direction, of the four side surfaces to sandwich the nozzle chip.