IAI Stadium Nihondaira (IAIスタジアム日本平, pronounced as I-A-I) is a football stadium in Shimizu-ku, Shizuoka, Japan. It is currently mostly used for football matches and has been the home stadium of the J-League's Shimizu S-Pulse since 1993. The stadium holds 20,339 people and was opened in 1991. In November 2008 a four-year naming deal effective from March 2009 was announced expected to earn S-Pulse 360,000,000 yen.