The present invention is a photocatalyst filter unit, and relates to this, the air cleaner using the same, more specifically, by laminating an aluminum sheet with a honeycomb or corrugated shape to form a plurality of cells capable of air to pass through and the inner wall of the cell has a predetermined thickness and the photocatalyst filter coated with titanium dioxide, both provided obliquely toward the ultraviolet lamp for irradiating ultraviolet rays over a photocatalyst consisting of the photocatalyst filter and the filter unit, it relates to air cleaners using. In the photocatalyst filter of the invention is a photocatalyst filter is used for the air cleaner, and the light reflectance of the laminated aluminum foil of good predetermined width in a honeycomb or corrugated shape to form a plurality of cells capable of air to pass within the cell side wall is the light emitted from the ultraviolet lamp by coating the titanium oxide having a predetermined thickness reflection a plurality of times in the cell is characterized in that so that the ultraviolet rays to reach the deep part of the cell. In addition, the photocatalyst filter unit of the present invention is a photocatalyst filter unit used in the air cleaner, honeycomb or koreo form a plurality of cells and an inner wall of the cell that is capable of stacking a gate shape for air to pass, the titanium oxide having a predetermined thickness by installing a predetermined angle inclined towards the two photocatalyst filter and the ultraviolet lamp coated with ultraviolet rays emitted from the UV lamp it characterized in that it can be uniformly received.