ABSTRACK The role of Ninik Mamak in the midst of society to lead nephews is a dream in all fields which include morals and material. Ninik Mamak in a custom is the judge ofpeace when there is a dispute in the people he leads. Based on this, Ninik Mamak as the traditional leader is required to improve his knowledge in the field of leadership and customary law. As Ninik Mamak, of course he h…