34°41′28.5″N 135°30′11.7″E / 34.691250°N 135.503250°ETekijuku (適塾) was a private school (Japanese: ja:私塾, Hepburn: shijuku) of Dutch studies (Rangaku) in Osaka, Japan.[1][2] Ogata Kōan, a doctor and scholar of Rangaku, established it in 1838 during the Tenpō era of the late Edo period.[1][2] Its official name was Tekitekisaijuku (適々斎塾), named after one of Ogata's art names, Tekitekisai (適々斎).[1][2] It was located in Osaka's traditional merchant neighborhood of Semba (船場) on the main trading route between Nagasaki and Edo.
The foreign language curriculum focused primarily on medicine, but also taught astronomy and other western sciences.
The school was one of the predecessors of Osaka University and Keio University, through the work of the most notable alumni Ogata Koan and Fukuzawa Yukichi, respectively.
