A static mixing module in which mixing parts having a relatively short length are assembled such that grids are formed with central strip portions and wing portions of the mixing parts or with the central strip portions, wing portions and tail portions of the mixing parts. Further, cut-off portions are formed between adjacent two wing portions. This configuration forms complex fluid passages. Each mixing part can be formed by a simple punching step and a bending step, each at least once, and a static mixing module can be manufactured by simply assembling these mixing parts. Therefore, the mixing module has a higher mixing/blending performance event though it has a length similar to conventional modules or packets, and has a reduced pressure loss. Further, since it can be cheaply manufactured compared to the conventional products, it is advantageous in terms of production costs and production efficiency.