In this paper, we will analyze the legal mobilization and its impact on the Closed Factory Workers Case, 2012-2014. The lawsuit of the Closed Factory Workers Case was one of the most significant lawsuits in recent Taiwanese social movements and has acted as a precedent for several social movements and legal mobilizations, including the Hung Chung-Chiu Case and the Sunflower Movement. This paper will analyze the three major groups that engaged in the legal mobilization of the Closed Factory Workers Case lawsuit: lawyers, legal academics, including law professors and students, and judges. The reason legal mobilization of the Closed Factory Workers Case accomplished its objectives effectively was that there was a strong support structure. In the Closed Factory Workers Case, social movement organizations unified closed factory workers, cause lawyers, legal aid foundations, law professors, and law students to persuade judges. We argue that although the legal mobilization was significantly successful and had a substantial impact on the result of the Closed Factory Workers Case; its importance was second to its social movement strategies.