This study was intended to test whether the external factors represented by Bank Indonesia Sharia Certificate (SBIS), Exchange Rate, Inflation and BI Rate significantly influence the Indonesia Sharia Stock Index (ISSI) during the period January 2015 to December 2018. This type of research is an explanatory research with quantitative approach. This study uses monthly time series data of each variable. The data analysis method uses multiple linear regression by first testing the classic assumptions using SPSS version 23. The results of this study showed that Bank SBIS have significant influence and positive relation toward ISSI and BI Rate have significant influence and negative relation toward ISSI. Inflation and Exchange Rate is not significant influence toward ISSI.