To provide a method for efficiently and stably harvesting oil having high quality as skin care oil or skin cream and preventing degeneration of its quality.

Fat mass is collected from a slaughtered ostrich body and passed through a chopper to be a minced state. The minced fat mass is put into a steaming cooker and oil is separated with 60-90°C hot water. Activated clay is added to the crude ostrich oil, agitated at 70-80°C for about 10 minutes and filtered by paper filter. Filtered oil is put into a vessel and kept at a state of reduced pressure for ≥1 days to remove odors. Tocopherol (vitamin E) is added to the oil, bamboo charcoal is dipped in the oil in 1/10-1/100 weight of the oil and stood for 10-20 days to enhance transparency and remove the odors.