Indigo Jam Unit (stylised as indigo jam unit) are a Japanese jazz band formed in the city of Osaka, Japan in 2005.
Indigo Jam Unit, a quartet, originated out of a trio consisting of Yoshichika Tarue (piano), Katsuhiko Sasai (double bass), and Isao Wasano (percussion and drums). In 2005, the trio had been playing live and working with different member setups when they started working with independent record label producer Kenichi Tateiwa of Basis Records, who suggested they add Takehiro Shimizu on drums to the line up. Shimizu joined the band in the months leading up to the recording of their first album, DEMONSTRATION, in August 2005. Shimizu currently (November, 2011) divides his time between Osaka, Japan, and New York City, NY.