Many things are considered when making investments. High returns are found to be the most important variable when investing in stocks and income stability as the most important variable when investing in fixed deposits Even things that are done in other countries do not take into account the experience of investors and their prospects for staying in the stock market, the type of information sought from third parties before making investment decisions. This study has a scope within the Muhammadiyah University of Ponorogo. The type of data used is primary data in the form of questionnaires distributed to Muhammadiyah University of Ponorogo Students. In this study using quantitative research types. The results of this study are known if the financial knowledge variable does not affect the financial behavior variable, then the financial ability variable has a positive and significant effect on the financial behavior variable, then it is known that the role of financial behavior on the financial ability path is as a mediator that mediates fully (full mediation), then it is known that the role of financial behavior on the financial knowledge path is not as a mediator but has a partial effect on investment interest, and the financial behavior variable has a positive and significant effect on investment interest of Students of the Faculty of Economics, Muhammadiyah University of Ponorogo.