EN
Behavioral Finance is now considered as a set of discoveries that explain mechanisms of some simplistic ways of making decisions (heuristics) as well as biases that come up with that process. Financial market investors are also susceptible to those behavioral biases. The article presents how heuristics of anchoring, availability and confirmative thinking may cause mistakes in capital market investment decisions. Theoretical aspects are illustrated by results of experiments that were taken by author with the group of Polish active investors and potential investors that were about to start investing.