the Six Big Losses that occur on the cutting machine. The research data are monthly data for the period January 2017 to June 2018. The sampling method used was purposive sampling. From a population of 18 carline areas with a total of 148 cutting machine units, 3 carline areas with the lowest OEE achievement as a sample. The analytical method used in the study is the analysis of OEE calculations and six big losses with a fishbone diagram analysis. The results showed the cause of the OEE value not yet achieved in the Toyota Bfree carline was the low Performance Efficiency results of 72.56% and the high Equipment Failure losses of 94.57%. In the Toyota Hiace carline is the low Performance Efficiency results of 69.25% and the high Equipment Failure losses of 88.70%. On the Toyota Vitz carline is the low availability of 76.81% and the high Equipment Failure losses of 87.01%. With suggestions for improvements given to increase the value of OEE companies based on factors Man, Machine, Method, Material, and Environment.