The objective of the study was to assess the composition and properties of Japanese quince and of Cornelian cherry fruit. The contents and levels of the following were determined: dry substance, extract, glucose, fructose, dietary fibre, total polyphenols, titratable acidity, and antioxidant activity. It was found that the Cornelian cherry fruit were characterized by a higher content of dry substance, extract, and monosaccharides compared to the Japanese quince fruit. The acidity of Japanese quince and Cornelian cherry was 4.11 and 3.91 %, respectively. The fruit analysed and assessed were characterized by the strong antioxidant properties and by the high content of polyphenols.