This research objective was to know the influence of Good Corporate Governance, Return On asset, and Firm Size to Firm Value On Company Registered in LQ45. Population The Grand Theory in this research are Agency Theory and Signaling Theory. Sampling method used is Purposive Sampling. The population of this research ware 45 companies of LQ45 and the sampples ware 12 companies of LQ45 indonesia during the period of 2012-2015. Data Analysis Technique used was Multiple Regression Linear. This

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... s partially showed that Good Corporate Governance and Firm Size had negative effect on Firm Value, while Return On Asset had posittive effect on Firm Value. While the results showed that Good Corporate Governance, Return On Asset, and Size had significant and positive effects to Firm Value. The implication of this research is Return On Asset has a dominant effect on firm value. The was high Return On Asset can cover the Good Corporate Governance and the Firm size of the company wrote the low, it can be seen from the magnitude of property owned. As the result those factors become the important thing for investors to invest in the company.