To provide an air cleaning filter which has a dust removing property and a deodorizing property and the deodorizing property of which can be regenerated by heating or irradiating with light while keeping the dust removing performance.

This air cleaning filter consists of an electret filter medium consisting of a polybutene-1-based fiber, preferably, a sheath-core conjugated fiber of polypropylene and polybutene-1 and a deodorizing sheet, preferably, a photocatalytic sheet.