A problem addressed by the embodiment of the present invention is to provide an air purifier in which the diffusion of heat to the outside of a cover can be suppressed. A pair of front face-side first flanges 23t and a pair of front face-side second flanges 23u are respectively formed by extending a side end of a second side surface 23ecc and a side end of a third side surface 23ecd toward the outside of a heating section-receiving section 23ec. A pair of rear surface-side first flanges 23w and a pair of rear surface-side second flanges 23x are respectively formed by extending a side end of a second side surface 23edc and a side end of a third side surface 23edd toward the outside of a heating section-receiving section 23ed. As a result, heat generated by a PTC heater 23b is unlikely to diffuse to the outside from a front face-side cover 23ea or a rear face-side cover 23eb.
