a liquid jet head includes a head portion having a supply flow path configured to allow liquid supplied from the outside to flow therethrough , a pressure chamber that communicates with the supply flow path , a driver element that drives the pressure chamber , and a nozzle that communicates with the pressure chamber for ejecting liquid droplets . a circuit portion supplies a drive waveform to the driver element . a cooling portion has a cooling flow path configured to allow the liquid to flow therethrough , and the cooling portion is coupled and fixed to the circuit portion to absorb heat energy dissipated by the circuit portion . the supply flow path and the cooling flow path communicate with each other so that the same liquid flows through both paths thereby eliminating the need for a dedicated cooling liquid system and achieving size and cost reduction .