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This study aims to examine the relationship of cognitive bias with investment decisions on lecturers. Investment activities can sometimes cause errors or bias in the process of perceiving information relating to investment. Cognitive bias is an error in the thinking of someone who tends to be illogical in understanding something. Lecturers, as educators, must think logically and rationally in determining investment decisions. This will be tested whether lecturers are generally more rational or irrational in determining investment decisions.The sample of respondents was 70 lecturers. Data collection comes from the results of questionnaires. Multiple regression analysis is used to identify 7 cognitive biases that influence investment decisions, namely Overconfidence, Conservatism, Anchoring, Herding, Availability, Representativeness, and Mental Accounting. In addition, which bias is the most dominant effect on investment decisions. The results showed that lecturers experience cognitive bias so that it can be said, they act irrationally in determining investment decisions. The insignificant biases in investment decisions are Overconfidence and Representativeness, because these biases have a negative effect, and the dominant cognitive bias is Mental Accounting.