The purpose of this research is to reveals the law nature of agent contractbetween the client and agent and theoretical ground of fee claim of agent, to inquirythe problem regarding the type, date for payment and limit of agent fee, and toprovide theoretical ground of demand for agent fee to the counterpart.Agent contract is an atypical and correspondence contract. Because ofcommercialism, Agent has a right of claim for fee in spite of agreement on agent fee.In the case a sum of fee isn t decided in agent contract, it considers a multi branchsituation from agent contract. In the case some contract is made by counterpart andathletes by agent, it is proper to say that agent will be able to charge counterpartfee.