Numerous small and medium-sized manufacturing companies have implemented or plan to introduce ERP for their own survival in the highly competitive global market. Despite of increasing number of companies implementing ERP, there has been few research on evaluation of ERP performance in small and medium manufacturers. Thus, in this paper, the impact of ERP implementation on the organizational performance based on Balanced Score Card is investigated and also critical success factors are discovered. The results of analysis show positive relationships between the ERP implementation and organizational performance. This paper suggests some practical implication on the ERP implementation to the practitioners.