It is an object to provide a vent filer that can reduce contaminants diffusing through the vent filter into the inside of a housing, and has high diffusion efficiency and low pressure loss. The vent filter has an adhesive layer 1 having a through-hole 1a at least in one area; a flow path member 2 provided with a flow path 2a in communication with the through-hole 1a; and an air-permeable membrane 3 covering the flow path member 2 and part of the adhesive layer 1, wherein the peripheral portion 3a of the air-permeable membrane 3 is fixed to the adhesive layer 1 and the flow path member 2 is held within a hollow portion formed between the adhesive layer 1 and the air-permeable membrane 3.