To provide an air cleaning passage device for cleaning the air by a photocatalyst to create purified air by decomposing harmful germs in the air and removing floating particles.

This air cleaning passage device by using a photocatalyst comprises a vent tube 1 having light permeability and a plurality of partitions partitioned by transparent tubes 2 or transparent partition plates. In this case, the tube 1, the tubes 2 or the peripheries of the partitions are all coated with a photocatalytic coating material. Thus, when gas passage through the tubes, harmful germs in the air are decomposed by the coating material and the air is purified.