Patent ID: 6851846

Claim:
A mixing structure comprising: a first flow pass; a second flow pass that is arranged on a level different from a level including the first flow pass; a plurality of first branch flow passes and at least one second branch flow pass that are alternatingly and separately disposed at the level including the first flow pass and that extend in a direction which is substantially the same as that of the first flow pass, the first branch flow passes being connected to an end portion of the first flow pass, the at least one second branch flow pass being connected to the second flow pass; and a mixing flow pass that is connected to end portions of the first and second branch flow passes, with the at least one second branch flow pass being in a state wherein the first branch flow passes and the at least one second branch flow pass are disposed alternately; wherein the mixing flow pass includes a section having a reduced flow pass cross-sectional area perpendicular to a flowing direction.