This study aims to investigate the impact of heuristic driven availability bias as a predictor of investment decision making. For this study, data was collected from investors in Delhi-NCR region in India. The findings offer empirical evidence supporting the hypothesis that availability bias has a positive relation with investment decision making, such that investors suffering from this bias are making irrational investment decision making. The finding is consistent with heuristic and biases theory, suggesting that investors are not rational being as assumed by standard finance, but have limit to their rationality and suffer from many heuristic and biases, which impact their investment decision making. The study contributes to the current body of literature on heuristic driven biases and their impact on investment decision making.