Economic development is one of the effort to realize "social justice for all Indonesian people", so the process of achieving should be pursued in a justice way, so that there is no imbalance that can make the goals not be attained maximally. Sharia Bank is the only banking system that explicitly states that banking activities are based on the justice principle. Based on that case, this paper will discuss what is the indicator of justice and how urgent is the application of justice principle in banking activities. Then, find out what investment policy models can enhance the role of the community to contribute to development through banking institutions that have applied the principle of justice. The results showed that: first, an indicator of justice in banking activities is based on an existence of the "harm" thing, banks with riba potentially harm both the bank and the customer; secondly, choosing banking services that contain injustice is just the same to choose madharat, because injustice is zhalim; thirdly, Indonesia can implement a policy model of separating deposit and investment accounts, which in investment products the bank acts as a facilitator rather than a fund manager as in deposit accounts. Keywords: Justice, Economic Development, Islamic Banking, Investment.