The article is devoted to the problem of jurisdiction of ‘starosta’ (a medieval official) during the second half of the 15th – the first third of the 16th century. ‘Starosta’ was one from the most important officials in the Volhyn land. He was designated by the Great Lithuanian Duke. During this period the judicial duties of ‘starosta’ were regulated by the norms of legislative acts named ‘ustavna zems’ka gramota’ issued by great Lithuanian duke in their home policy. An author shows in his materials, that according to these documents ‘starosta’ was the main person at the time of legal proceedings.