This research discusses about the Increasing Japanese – American Military Cooperation to Facing North Korea’s Military Provocation. The purpose of this research is to analyze and find out about the increasing of Japan - America Facing North Korea's Military Provocation. Based on the research that has been done, the author has found the fact that the efforts made by Japan - America in facing North Korea's military provocation are by strengthening its military alliance between Japan - America and building trilateral cooperation between Japan - America - South Korea.