A liquid discharge apparatus, comprising: a plurality of main tanks (C1 - C8) to store a liquid; a plurality of liquid discharge heads to discharge the liquid from nozzles (n); and a plurality of supply channel members, each supply channel member comprising: a plate having opposing side surfaces; a plurality of main channels (Ma, Mb, Mc, Md) formed inside the plate between the opposing side surfaces, the plurality of main channels (Ma, Mb, Mc, Md) disposed parallel to each other in a plane parallel to the side surfaces of the plate, wherein the main channels (Ma, Mb, Mc, Md) each form an inlet (mi) for connection to the main tanks (C1 to C8) and an outlet (mo) for connection to the discharge heads; a plurality of branch channels (Sa, Sb) formed inside the plate and branched from the plurality of main channels (Ma, Mb, Mc, Md), respectively, wherein the branch channels (Sa, Sb) form channels from the main channels (Ma, Mb, Mc, Md) to a side surface, and at least two of the plurality of branch channels (Sa, Sb) are branched from each of the plurality of main channels (Ma, Mb, Mc, Md); and a connection tube to connect one of the plurality of branch channels (Sa, Sb) to another of the plurality of branch channels (Sa, Sb). a plurality of main tanks (C1 - C8) to store a liquid; a plurality of liquid discharge heads to discharge the liquid from nozzles (n); and a plurality of supply channel members, each supply channel member comprising: a plate having opposing side surfaces; a plurality of main channels (Ma, Mb, Mc, Md) formed inside the plate between the opposing side surfaces, the plurality of main channels (Ma, Mb, Mc, Md) disposed parallel to each other in a plane parallel to the side surfaces of the plate, wherein the main channels (Ma, Mb, Mc, Md) each form an inlet (mi) for connection to the main tanks (C1 to C8) and an outlet (mo) for connection to the discharge heads; a plurality of branch channels (Sa, Sb) formed inside the plate and branched from the plurality of main channels (Ma, Mb, Mc, Md), respectively, wherein the branch channels (Sa, Sb) form channels from the main channels (Ma, Mb, Mc, Md) to a side surface, and at least two of the plurality of branch channels (Sa, Sb) are branched from each of the plurality of main channels (Ma, Mb, Mc, Md); and a connection tube to connect one of the plurality of branch channels (Sa, Sb) to another of the plurality of branch channels (Sa, Sb). a plate having opposing side surfaces; a plurality of main channels (Ma, Mb, Mc, Md) formed inside the plate between the opposing side surfaces, the plurality of main channels (Ma, Mb, Mc, Md) disposed parallel to each other in a plane parallel to the side surfaces of the plate, wherein the main channels (Ma, Mb, Mc, Md) each form an inlet (mi) for connection to the main tanks (C1 to C8) and an outlet (mo) for connection to the discharge heads; a plurality of branch channels (Sa, Sb) formed inside the plate and branched from the plurality of main channels (Ma, Mb, Mc, Md), respectively, wherein the branch channels (Sa, Sb) form channels from the main channels (Ma, Mb, Mc, Md) to a side surface, and at least two of the plurality of branch channels (Sa, Sb) are branched from each of the plurality of main channels (Ma, Mb, Mc, Md); and a connection tube to connect one of the plurality of branch channels (Sa, Sb) to another of the plurality of branch channels (Sa, Sb).