This study aims to understand the effect the trust, norms, and networks on social capital and the social capital itself on the financial performance of Islamic cooperatives. This research is useful for sharia cooperatives to assess the influence of social capital on financial performance through interaction between members, to increase the growth of financial performance. This study uses quantitative research methods with SEM-PLS analysis. Each of the indicators is assessed using a Likert scale measurement. The object of the research is sharia cooperatives in five districts of DIY. They are selected as samples using the purposive sampling method. Data is collected by distributing questionnaires to cooperative members and also by analysing the financial statements of the sharia cooperatives during 2016-2017. The results of the study are that trust does not affect social capital, while norms and networks influence social capital significantly. Furthermore, social capital with indicators in the form of norms and networks influence the financial performance of sharia cooperatives