In January 2009, Inui was selected the Japan national team for 2011 Asian Cup qualification. At this qualification, he debuted against Yemen on January 20. He also participated 2013 Confederations Cup and 2015 Asian Cup. In 2018, he was selected the Japan for 2018 World Cup. He played as left midfielder in all 4 matches and scored 2 goals. In 2019, he also played at 2019 Asian Cup and Japan won the 2nd place. He played 36 games and scored 6 goals for Japan until 2019.