Motorcycle industry in Jakarta has developed very rapidly. It is because the motorcycle industry become primary attention in market structure and behavior of the industry. Motorcycle industry in Indonesia aims to produce a better quality product and increase sales of motorcycle products, in order to generate maximum profits. This study aims to analyze the market structure of the motorcycle industry in Jakarta in 2009 until 2012. Motorcycle companies use in this research are members of the AISI (Indonesian Motorcycle Industry Association) a motorcycle with brands Yamaha, Honda, Suzuki, Kawasaki and Kanzen. The method of analysis used in this study is concentration ratios CR4 and IHH calculation, to determine the market share of the motorcycle industry in Jakarta. The results showed the motorcycle industry in Jakarta have an oligopoly market structure with a concentration above 90 percent in 2009-2012.