To provide a stabilizer which can effectively inhibit the decomposition of an organic peracid, is inexpensive and is scarcely toxic, and to provide a method for stabilizing the organic peracid with the same.

1. This method for stabilizing the organic peroxide, characterized by adding ethylenediaminetetraacetic acid compound and a phosphoric acid compound as stabilizers to an organic peroxide solution. 2. The stabilizer for the organic peracid, containing the ethylenediaminetetraacetic acid compound and the phosphoric acid compound.