Abstract: Large diameter nodes integrally formed on a linear fiber at an appropriate interval to form a fiber body, so that multiple fiber bodies are attached to a support member in a state where slits are formed between adjoining fibers due to the large diameter nodes by arranging multiple fiber bodies in parallel with one another or laminating the multiple fiber bodies with one another. It is preferable that a thickness of the fiber of the fiber body is set to range from 0.003 to 0.05 mm, and an outer diameter of each large diameter node is set to be 1.03 to 1.50 times as large as the thickness of the fiber, and an interval of the large diameter nodes is set to be 5 to 100 times as large as the thickness of the fiber. With such a construction, it is possible to obtain the filtrating filter which is simple in construction and manufactured with ease, particularly capable of easily forming slits to have an arbitrary size through which liquid or gas to be suitably filtrated.