INK JET HEAD

An ink jet head includes a substrate including a plurality of pressure chambers spaced from each other along a first direction, each pressure chamber being connected to a corresponding nozzle in a plurality of nozzles, a plurality of actuators, each actuator configured to cause a pressure change in a corresponding pressure chamber in the plurality of pressure chambers in response to a driving signal, a driving circuit including a plurality of driving elements to generate driving signals, a first temperature adjustment unit in contact with the driving circuit and having a first thermal conductivity, and a second temperature adjustment unit having a first flow path, a second flow path, and a second thermal conductivity that is lower than the first thermal conductivity. The first flow path is in contact with the substrate, and the second flow path is between the first flow path and the first temperature adjustment unit.