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Investment decision making is a process of selecting the best alternative from a number of available investment alternatives in the psychological situation and condition of the investor at a certain time. Investment decision making will be greatly influenced by the information received, as well as the level of ability and knowledge of investors about investment. This study aims to determine the effect of irrational, emotion and illusion of control investors in making investment decisions in the Indonesian capital market. The survey was conducted on 100 investors in 5 investment galleries in Bali. Primary data was collected through questionnaire distribution, then analyzed descriptively using SPSS V.26.0 program. The results of this study indicate that investors' irrational, emotion and illusion of control have a negative and significant effect on investment decision making in the Indonesian capital market. This means that the higher the investor's irrational, emotion and illusion of control, the lower his investment decision-making ability. This shows that there is a psychological tendency for investors to influence their decisions in making decisions.