Object of this research is to show that, within the framework of the current debate on the government of company, the starting point of the theory of agency is the divergence of interests between the owners and the leaders. It results a relation from it from agency, in which, one of the parts, indicated like agent, acts in the name of the other part, called the principal. So, principal and agency can have interest divergences. Our discussion thread throughout this research is the interest conflicts in the theory of agency.