PURPOSE: To enable the purification of a fluid in good efficiency at the peripheral wall of a fluid passage, by a method wherein a layer having a penetrating fluid passage of which the inlet port part is closed and a layer having a piercing fluid passage of which the outlet port part is closed are mutually arranged and the peripheral walls of said fluid passages are formed from an air permeable material.

CONSTITUTION: Layers 17 of which fluid inlet ports 16 are closed are mutually arranged and layers 18 of which outlet ports 19 are closed are mutually arranged to form a structure wherein a fluid can not directly pass the outlet ports. The peripheral wall of each fluid passage is constituted from fluid permeable ceramic having fine gap pores and the fluid is advanced to the direction shown by an arrow from all positions and the fluid purified by filtering and collecting carbon fine particles at the peripheral wall is discharged from the outlet. Because the fluid is purified as described above and the filtering surface area is large, the collection of fine particles in the fluid is carried out certainly in good efficiency and the purified fluid is discharged.