This is a preliminary study to look at the undergraduate students of Petra Christian University, whose major are not learning business and economics, whether they are eager to become entrepreneurs after being influenced by their family, peer groups, friends or other influential social factors. In this study, the social factors are considered as creating the informal education. The study also looks at the personal factors, which are reflected in their mindset and grit. The students, whose parents are mostly business owners, have a high intention to become entrepreneurs. As the data were collected from 103 students using questionnaires, the result shows that informal education and mindset have significant influences on entrepreneurial intention. Grit, or perseverance and persistence, strengthens the relationship between informal entrepreneurial education and entrepreneurial intention. However, grit does not play any effect on the relationship between entrepreneurial mindset and entrepreneurial intention.