The goal to be achieved in this study is to determine the effect of Return On Assets (ROA) and Return On Equity (ROE) affecting the Capital Adequacy Ratio (CAR). This research was conducted on banking companies indexed Lq 45 on the Indonesia Stock Exchange (IDX). The analysis used in this research is multiple linear regression analysis with SPSS program. The data collection technique used in this research is using secondary data, namely by using library data for companies with an index of Lq 45 listed on the Indonesia Stock Exchange (IDX). The population in this study are 45 companies indexed Lq 45 on the Indonesia Stock Exchange (IDX) companies that meet the criteria as many as 5 banking companies. Based on the results of research with statistical tests, it shows that partially ROA has a significant effect on CAR. While ROE partially has a significant negative effect on CAR. Based on the F-statistical test, the ROA and ROE variables proved to have a significant negative effect on CAR. Keywords: Pengaruh; Return on Asset (ROA) dan Return On Equity (ROE)