PROBLEM TO BE SOLVED: To provide a sterilizing detergent composition having a sterilizing effect on Eumycetes and general bacteria, and having a high detergency. SOLUTION: The sterilizing detergent composition contains a compound represented by formula (I) and a nonionic surfactant, and is composed of an aqueous solution of 7 to 12 in pH. In the formula, R1is a 1-3C saturated linear alkyl group; R2is an 8-12C saturated linear alkyl group; X-is a halogen ion; and Y is an 8-12C saturated linear alkylene group. COPYRIGHT: (C)2013,JPO&INPIT