This study explores (1) the political conflicts in Thailand contributing to the military coup; (2) claims on the legitimacy of the coup and; (3) the roles of the military during the political crises. Adopting a qualitative approach, the author analysed documents, reports, research, books, newspapers and other publications concerning the political crises between 2010 and 2014. Furthermore, political figures were interviewed to obtain important data. They were analysed using descriptive statistics. Findings revealed that the political conflicts arose from the government's attempt to propose an Amnesty Bill, which provoked public controversy. Such disapproval brought about anti-government protests and when these slid into chaos, it prompted the military to stage a coup. The reason behind the coup was political conflict. Moreover, the government's lack of political legitimacy made the coup even more justified. With regards to the military's role during the political crises, it was redefined according to the political situations and contexts. This adjustment gave rise to the military's right for political intervention