To provide an air cleaner putting the respective merits of an air generating source using a fan and an ion wind generating source to practical use to the max. degree, not requiring manual changeover operation and good in user's convenience.

This electrostatic air cleaner is constituted of a fan 5 installed as an air generating source, an ion wind generation part consisting of an ionizing electrode 3 and an earth electrode 4 forming a high electric field between both electrodes 3, 4, a dust sensor 7 detecting the density of dust in air and a control part 12 driving the fan 5 when the density of dust detected by the dust sensor 7 becomes a predetermined value or more and stopping the fan when the density of dust detected by the dust sensor 7 is below the predetermined value.