We have investigated how to increase customer satisfaction(CS) through leaders' coaching. For the purpose of increasing CS we examined how coaching behaviors affected organization members' competence and willingness. Then we examined how those affected employee satisfaction(ES) and CS. The four elements of coaching are Direction, Development, Accountability, and Relationship. The results have been quite astonishing. We have found that relationship is the most powerful coaching element among others in terms of the scope of the influence. Other words, relationship affects both competence and willingness for the members in the organizations. It is the author's conclusion that in order to have many satisfied customers the leaders of the organizations need practice more coaching as the training tools. This will bring about result in better financial and non-financial performance and other ways, such as quality and morale, for the organizations.