Every company should implement Good Corporate Governance (GCG), hoping by implementing GCG the company will get value-added and achieve sustainability business. Besides that, it is important to see the return for the company if it implements GCG especially for the value of the firm. This paper is an empirical study to investigate the impact of the Corporate Governance Perception Index (CGPI) on a firm's value which is measured by using the Price to Book Value (PBV) ratio. Besides that, this study used the publication of Corporate Social Responsibility (CSR) as moderating variable to see whether CSR could make CGPI's effect stronger in impacting PBV, therefore this study used 2 research model where model 1 uses CGPI and CSR and addition CSR as moderating variable in model 2. The result of research model 1 shows that CGPI has a negative significant impact on PBV and CSR has a negative insignificant impact on PBV. Research model 2 shows that both CGPI and CSR have a negative insignificant impact on PBV while moderating variable has a positive insignificant impact on PBV. This study showed different results from the previous study.