A method of deinking waste paper for reclamation thereof, which comprises disintegrating waste paper with an alkali in water in the presence of a fatty acid polyoxyalkylene ester having the formulaR--COO(PO)x(AO)y(PO)z--Hwherein R is an alkyl or alkenyl of 7-21 carbons, PO is an oxypropylene group, AO is an oxyethylene group, or a mixed oxyalkylene group composed of an oxyethylene group and at least one oxyalkylene group selected from the group consisting of an oxypropylene group and an oxybutylene group, and x is a numeral of 1-20, y is a numeral of 1-50, and z is a numeral of 1-50, as a deinking agent.