The study aimed to analyze the influence of Corporate Governance mechanism that consist of board of commissioners, board of directors, board of independent, institutional ownership, manajerial ownership, audit committee to financial performance of manufacturing companies in the period 2012-2014. This study also used the agency cost as  intervening variable. The population in this study is manufacturing companies on the Indonesia Stock Exchange. Sampling was done by purposive sampling method that gotten 30 manufacturing companies in each period. This study uses secondary data that are 30 annual reports of the manufacturing companies on Indonesia Stock Exchange in the period 2012-2014. The testing of hypothesis in this study uses descriptive analysis, classical assumption, regression analysi. The result of this study showed that board of commissioner, board of independent and audit committee effect significantly to financial performance (ROE). Board of commissioner and board of independent effect significantly to agency cost. The results also show that the agency cost is not proven as an intervening variable between corporate governance mechanisms of financial performance (ROE). 
Keywords: corporate governance, financial performance, agency cost