The article examines the philosophical and moral foundations of the biggest economist and political philosopher of the 20th century John Maynard Keynes (1883-1946), who played an important role in rethinking a number of important provisions of the classical political economy and in creating the ideological and methodological basis of the "Keynesian revolution" and of the new field of economic analysis-macroeconomics. The author traces the main stages in the formation of ethical views of Keynes, shows that his interest in ethics as the system of values in society was dictated by the need for the new conceptual vision of economic realities and by the search of an answer to the main ethical question: "What should we do?". Attention is drawn to...