This research aims to know the intrinsic pricing stock using Price Earnings Ratio, as well as to know how to price the intrinsic was used in stock investment decision-making. This research was conducted on the company entered in the index LQ45 during the period 2010-2012 are listed on the Indonesia stock exchange. This research is descriptive research using a quantitative approach. There are 26 companies sampled in this study. The results showed, there are 10 companies whose shares are included in the category of Undervalued. The rest, there are 16 companies whose shares are included in the category of Overvalued. The decision takenis tobuy shareson the conditionUndervaluedandsellshareson the conditionOvervalued.