A liquid jet head is provided with: a nozzle plate which includes a nozzle array having a plurality of nozzle holes arranged side by side along a Y direction; an actuator plate which is laminated on the nozzle plate and includes a channel group having a plurality of first channels communicating with the nozzle holes, the first channels being arranged in parallel at intervals along the Y direction; and an inlet ink chamber and an outlet ink chamber both communicating with the first channels on opposite ends in an extending direction of the first channels. A film member which can be warp-deformed along with pressure fluctuation inside the inlet ink chamber and the outlet ink chamber is arranged as a part of inner surfaces of each of the inlet ink chamber and the outlet ink chamber.