The study of the feeding behavior of the Black-billed Roller was undertaken in the central part of Thailand, especially in Supun Buri and Patum Thani Provinces, during November 1983 to April 1984. The Black-billed Roller lives in open country, deciduous forest and culivated field. They are diurnal in habit or feed in daytime. The food which was analyzed by the stomach content method consists of insects 84.50%, amphibians 8.45%, spiders 4.25%, centipedes and field crab make 2.82% of the total food. They typically hunt by short sorties from exposed perches, mainly telephone wire and top of the branches of the trees. The Black-billed Roller catch their prey alive with the bill, and swallow them whole. With this feeding behavior, they serve a valuable function for mankind in helping to eliminate pests and balancing prey populations.