Disclosed herein is a mixed composition for a refrigerator, which contains: a refrigerant containing at least one unsaturated fluorinated hydrocarbon compound selected from compounds represented by the following molecular formula (1): CpFrHs, and a refrigerator lubricating oil containing, as a major component, a polyoxyalkylene glycol compound represented by the following general formula (2), and containing an amine compound in an amount of 1.0% by mass or more based on the total amount of the refrigerator lubricating oil: R1—[(OR2)m—OR3]n (2). According to the present disclosure, a mixed composition for a refrigerator can be provided that has a less possibility of autoignition under a high temperature environment even in an unexpected leakage thereof in a refrigerator using a refrigerant containing a slightly flammable refrigerant, and a refrigerator lubricating oil can be provided that is capable of being applied to the mixed composition for a refrigerator.