a main body comprising a channel unit, a reservoir unit configured to store ink supplied to the channel unit, a plurality of nozzles, a plurality of pressure chambers, a plurality of actuators, and a plurality of actuator terminals, wherein each nozzle is connected to a uniquely corresponding pressure chamber, each pressure chamber is coupled with a uniquely corresponding actuator, each actuator is connected to a uniquely corresponding actuator terminal, and when a driving voltage is applied to a selected actuator terminal, ink within the pressure chamber coupled with the actuator connected to the selected actuator terminal is pressed and ink is discharged from the nozzle connected to the pressure chamber;

a driver IC being configured to select any actuator terminal among the plurality of actuator terminals and transmit the driving voltage to the selected actuator terminal; and

a sheet having a first surface and a second surface, the driver IC being mounted to the sheet at the first surface, and the sheet being fixed to the main body at the second surface, the sheet comprising a plurality of input terminals, a plurality of output terminals distributed on the second surface, a plurality of first wirings connecting the input terminals and the driver IC, and a plurality of second wirings connecting the driver IC and the output terminals, wherein the second wirings pass through the sheet from the first surface to the second surface,

wherein each output terminal is connected to a uniquely corresponding actuator terminal,

wherein the reservoir unit and the channel unit form a gap, and

wherein the sheet is located in the gap.