A liquid discharge head comprising a liquid discharge unit for discharging liquid and a liquid supply unit serving as a supply path for supplying liquid to the liquid discharge unit , wherein the liquid discharge unit comprises: a substrate , where a plurality of recording elements arranged to generate thermal energy used to discharge liquid is disposed; and a discharge orifice forming member , where a plurality of discharge orifices , respectively facing the plurality of recording elements , and arranged to discharge the liquid, is formed, wherein the liquid discharge unit has a plurality of pressure chambers , each provided with a first liquid channel arranged to supply liquid to the pressure chamber , and a second liquid channel arranged to recover liquid from the pressure chamber , and wherein the substrate has, for the plurality of pressure chambers, a common liquid supply channel connected to the first liquid channels to supply liquid to the first liquid channels , and a common liquid recovery channel connected to the second liquid channels , to recover liquid from the second liquid channels ; the liquid discharge head being further provided, between the liquid supply unit and the liquid discharge unit , with a negative pressure control unit for controlling liquid pressure to within a constant range centered to a control pressure, said negative pressure control unit having a first pressure adjustment mechanism (H) connected to the common liquid supply channel and a second pressure adjustment mechanism (L) connected to the common liquid recovery channel , wherein the second pressure adjustment mechanism (L) has a lower control pressure than the first pressure adjustment mechanism (H) adapted such that both the pressure at the inlet portion of the common liquid supply channel and the pressure at the outlet portion of the common liquid recovery channel are negative pressures, and pressure at an inlet portion of the first liquid channels is set to be 30 to 1400 mmAq higher than pressure at an outlet portion of the second liquid channels . a substrate , where a plurality of recording elements arranged to generate thermal energy used to discharge liquid is disposed; and a discharge orifice forming member , where a plurality of discharge orifices , respectively facing the plurality of recording elements , and arranged to discharge the liquid, is formed, wherein the liquid discharge unit has a plurality of pressure chambers , each provided with a first liquid channel arranged to supply liquid to the pressure chamber , and a second liquid channel arranged to recover liquid from the pressure chamber , and wherein the substrate has, for the plurality of pressure chambers, a common liquid supply channel connected to the first liquid channels to supply liquid to the first liquid channels , and a common liquid recovery channel connected to the second liquid channels , to recover liquid from the second liquid channels ; the liquid discharge head being further provided, between the liquid supply unit and the liquid discharge unit , with a negative pressure control unit for controlling liquid pressure to within a constant range centered to a control pressure, said negative pressure control unit having a first pressure adjustment mechanism (H) connected to the common liquid supply channel and a second pressure adjustment mechanism (L) connected to the common liquid recovery channel , wherein the second pressure adjustment mechanism (L) has a lower control pressure than the first pressure adjustment mechanism (H) adapted such that both the pressure at the inlet portion of the common liquid supply channel and the pressure at the outlet portion of the common liquid recovery channel are negative pressures, and pressure at an inlet portion of the first liquid channels is set to be 30 to 1400 mmAq higher than pressure at an outlet portion of the second liquid channels . <EOS>