Sonsai, Tsuboiya Takichiro, 1736–1802) was a Japanese scholar, artist and art connoisseur.
[1] At an early age, Kimura was trained in painting by Ōoka Shunboku and Yanagisawa Kien.
He also studied the natural sciences, learning from Tsushima Tsunenoshin and Ono Ranzan.
After retiring to Ise, he spent his time collecting objets d'art and painting, earning a reputation as a capable landscape painter of the nanga school under the pen-name Sonsai.
[2] His collection was highly respected, and was purchased by the Japanese government after his death for the considerable sum of 500 ryō.