To provide a low-viscosity lubricating oil composition which is effective for power saving, deposits little sludge on a compressor's delivery valve even after a long-term use, can prevent a slide part from being worn in spite of its low viscosity, and can allow a stable refrigerating machine operation without lowering its efficiency over a long period of time.

The lubricating oil composition for the refrigerating machine using a 3 or 4C hydrocarbon as a refrigerant has a kinematic viscosity of 8 to 150 mm2/s (0°C), a sulfur content of not higher than 500 ppm, and an aniline point of not lower than 50°C. Desirably, the lubricating oil composition for the refrigerating machine comprises a mineral-oil-based lubricating oil having a kinematic viscosity at 0°C of 10 to 100 mm2/s, a viscosity index of not lower than 80, a sulfur content of not higher than 500 ppm, an aniline point of not lower than 50°C, and an aromatic component content of not higher than 10 wt.% (as measured by column chromatography).