Located at the place (Koaza Sorabiro, Oaza Yuyadani, Ujitawara-cho, Tsuzuki-gun, Kyoto Prefecture) where Soen NAGATANI, who is said to have invented and promoted 'Aosei Sencha Seiho' ('Blue Method' to produce Sencha, or unfermented green tea) in 1738, used to live and the Nagatani family had lived until the Meiji period, Nagatani Soen Seika (the birthplace of Soen) is a facility which was built by local volunteers to preserve his tools for tea production and the remains of his Hoiro (device to heat and dry tea leaves) in 1960.
永谷宗円生家（ながたにそうえんせいか）とは、元文3年（1738年）、「青製煎茶製法」を開発・普及させたと伝えられる永谷宗円が暮らし、明治まで永谷家が存在していた場所（京都府綴喜郡宇治田原町大字湯屋谷小字空広）に、製茶道具やほいろ跡を保存するため、地元有志の手により昭和35年に建設された施設。