The objective of this research is to investigate about the effects of financial behavioral traps on the decision making quality of investors in the investors of Tehran Stock Exchange. This study is practical and in terms of research methodology is descriptive and correlation. The statistical population of the study includes all managers who are working in the Tehran stock brokers that the sample in question according to its number selected 84 persons. For data collection questionnaires of Samadi et al. financial behavioral traps and questionnaire of investment perceptual errors made by Gholipour have been used. After gathering data the analysis of data were done by using descriptive and inferential statistics. Results of regression tests indicate that all aspects of behavioral financial traps include “greed,” “escape from loss,” “being hasty” and “escape from regret” affecting the quality of investor decision making significantly.