The typology of the organization is a form of Niniok Mamak’s role in carrying out existing policies for the Kampar indigenous people. The important role of Niniok Mamak is a leader who regulates and nurtures their nephew’s children following customary and religious rules. This research is qualitative research to collect written descriptive data and oral data from the observed object. Primary data sources are obtained by digging from the source directly to the respondent. In addition, data were obtained through interviews and direct observations in the field. The primary data sources in this study were the Ninik Mamak in the Kampar district community. The secondary data sources are indirect data sources that can provide data for research and were obtained from literature studies, documentation, print media, and electronic media. The results of the research on the role and function of the Niniok Mamak in Kanagarian Kuok in determining the customs have their respective functions which in this study, the total number of Niniok Mamak has 20 (twenty) Niniok Mamak tribal chiefs consisting of 4 (four) tribes: (1) Munip Melayu Nan 9 led by Datuk Penghulu Besar; (2) Munip Piliang Nan 7, led by Datuk Paduko Simarajo, in Piliang Nan 7 there are four Caniago; (3) Munip Domo Nan 3, led by Datuk Paduko Tuan; and (4) Petopang Nan Tunggal was led by Datuk Pakomo. In carrying out the role and function of the Niniok Mamak in the Kerapatan Adat Negeri (LAM/LAK), it is obligatory to take an oath of office as the children’s leader and the community in Kanagarian Kuok. Guidelines in carrying out the roles and functions of traditional leaders in Kanagarian Kuok adhere to: “adat yang bersendikan syarak, syarak bersendikan Kitabullah” (adat based on syarak, syarak based on the Book of Allah). Syarak said the custom of wearing would be accounted for in the hereafter.