Bank of Sharia is a bank that in its activities, both raising funds and in the context of channeling funds, provides and imposes compensation in accordance with Islamic law. Its activities does not charge interest, or does not pay interest to customers. Rewards received by Islamic banks, as well as those paid by customers depend on the contract and agreement between the customer and the bank. Related to the transaction contract practiced by Islamic banking. The mura>bah}ah contract is the contract that is most sought by the public. This contract dominates other contracts such as musha>rakah, mud}a>rabah, salam, istis}na>’, qard} and ija>rah. The purpose of this study is to analyze the influence of internal and external factors of Islamic banking, namely third party funds (DPK), capital adequecy ratio (CAR), number of sharia bank offices, equivalent rate (ER), and inflation on the amount of mura>bah}ah financing in Islamic banking in Indonesia. The analytical method used in this study is multiple linear regression. The results of this study indicate that third party funds (DPK), capital adequecy ratio (CAR), number of sharia bank offices, equivalent rate (ER), and inflation together have a positive effect on the value of mura>bah}ah financin.  Partially, third party funds (DPK) have an influence positive towards mura>bah}ah financing. While the number of sharia bank offices and equivalent rate (ER) has a negative effect on mura>bah}ah financing. Then, capital adequecy ratio (CAR) and Inflation have no effect on the amount of mura>bah}ah financing. Keywords: Mura>bah}ah financing, External factor, Internal factor