The aim of analyses was to check for existence of herding effect on the Stock Exchange in Warsaw. The approach assuming its existence presumes that investors don't bother with fundamental factors related to individual stocks but follow the market, affecting in similar way all stock returns. Results presented in this article showed variable intensity of herding on the stock exchange and confirmed remarks from other authors that it has the biggest impact in relatively stabile periods but not in periods when market is under stress and substantial price changes take place.