ECB’s negative interest rate policy leads to more and more higher risks in banks. The hypothesis is, that ECB's negative interest rate policy leads to significantly higher credit risks. The article researches the effects on credit risk indicators and the indeed risk development in banks. The author extends the analyzes carried out by other authors with his own data evaluation. External studies relate almost exclusively to macroeconomic data. The author researches one step deeper. For this purpose, raw data from all european commercial banks are analyzed. Therefore a correlation analysis between the 'deposit facility' and the respective characteristic was tested. This serves to check whether a change in the variable is causally related to the drop in the deposit facility. In addition, in individual cases a quadratic regression analysis supples the correlation analysis. This was useful in cases where lowering the deposit facility initially led to significant changes in the trait, but active management normalized it again. Direct effects on commercial banks credit risks can be proven by authors quantitative research.