The ceramic filter is composed of a porous body having two end surfaces and an outer peripheral surface and partition walls forming a plurality of main passages of purified fluid penetrating from one end surface to the other end surface and arranged on the inner wall surface of the main passage Filter membrane. Passing into the main flow path through the opening on one end surface side, the purified fluid passes through the filter membrane and the inside of the porous body for purification, and is taken out from the outer peripheral surface of the porous body as the purified fluid or passes through the outer peripheral surface of the porous body Inflow, the purified fluid passes through the inside of the porous body and the filtration membrane for purification, and is taken out as the purified fluid from the opening of at least one end surface side of the main flow path.
