INK JET HEAD

According to one embodiment, an ink jet head includes a first pressure chamber connected to a first nozzle, a first actuator substrate including a first actuator that is configured to cause a pressure change in the first pressure chamber to discharge ink through the first nozzle in response to a first driving signal, a first driving circuit configured to generate the first driving signal, a first temperature adjustment unit in contact with the first driving circuit and having a first thermal conductivity, and a second temperature adjustment unit having an internal flow path through which a liquid can flow and a second thermal conductivity that is lower than the first thermal conductivity, the second temperature adjustment unit being in contact with the first actuator substrate.