An air cleaner X1 includes a cleaning chamber (R2) through which air can pass, an ultraviolet light source (12) provided in the cleaning chamber (R2), a flow generator (11) for generating an air flow in the cleaning chamber (R2) by passing air through the cleaning chamber (R2), and photocatalyst granules (13) having a photocatalytic function, held in the cleaning chamber (R2), and displaceable by the air flow.
