Entrepreneurial Intention (EI) examines both internal motivation to start a new business for personal desires (meaning and purpose in life) and external motivation (monetary reward). Each motivation is influenced differently by demographic, attitude, and aptitude factors. This study focuses on the impacts of attitudes, aptitude, and demographic factors, which have an impact on entrepreneurial intention of young adults in Thailand. The survey sample includes 1,500 participants from Bangkok, northern, southern, northeastern, and central parts of Thailand. We equally divide the number of participant for each region into 300. The questionnaires are delivered to universities in these regions. We conducted surveys with 799 business students and 701 non-business students. We employed the multiple regression analysis to analyze the survey results. Our results showed that all attitude and aptitude factors have the strong relationship with Entrepreneurial Intention.