A breast milk sterilizing apparatus provided with a nursing bottle (1) holding breast milk, a holder cylinder body (2) of metal having a cylindrical wall portion (21) to which the nursing bottle (1) is inserted, a heater (5) and a heater temperature sensor (S2) wound around a periphery of the cylindrical wall portion (21), a breast milk temperature sensor (S1) to measure breast milk temperature on a bottom face (18) of the nursing bottle (1), and a breast milk temperature controlling portion (8) to control the heater (5) based on a breast milk temperature measured value (T1) measured by the breast milk temperature sensor (S1).
