The aim of this study was to determine the frequency of Helicobacter pylori (H. pylori) infection and its influence on the symptoms of Parkinson's disease. The study group consisted of 58 people with Parkinson's disease aged 49 to 83 years old, and 26 of their spouses. Percentage of people infected by H. pylori was similar between people with Parkinson's disease and their spouses. In the same time in this study percentage of people infected by this bacterium was lower than in other studies of polish population. There was no relation between Parkinson's disease and H. pylori infection in the investigated group of patients suffering from Parkinson's disease.