四國旅客鐵道
The Shikoku Island League has two principal sponsors, the Shikoku Railway Company (JR Shikoku) and the Shikoku Coca-Cola Bottling Company. Other sponsors include Taiyo Oil Company, Shikoku Meiji Dairies, Japan Airlines, sporting goods maker Mizuno Corp., Internet service provider Biglobe, convenience store chain FamilyMart, and Nihon McDonald's.