In this lecture, we will discuss various aspects of the role that the media plays in policy making. The media is called the Fourth Power after the government, diet and judiciary. In the past, the media such as newspapers and television were the mainstream, but digital media such as the Internet are also joining here. However, because the media acts as a check of power, it also plays a major role in public opinion formation. The two roles of power checking and public opinion formation will also play important roles in policy making. Those in charge of administration and those in charge of legislation especially emphasize the power of newspaper editorials. In this lecture, 11 editorial writers in charge of the Nihon Keizai Shimbun editorial and signature columns will discuss the role of the media in policy making in their respective fields of expertise. In the first half of the 13 lectures, we will discuss the relationship between media transformation by digitization and domestic policy formation, and in the second half, policy formation and media in each country such as the United States, China, and South Korea.