She was born in Kurayoshi, Hoki Province (Kurayoshi City, Tottori Prefecture) in 1744 to her father, Soken IWAMURO who was a vassal of the Arao clan, a family of chief retainers of the Tottori Domain, and her mother, Orin who was a daughter of an iron wholesaler.
延享元年（1744年）に伯耆国倉吉（鳥取県倉吉市）で、鳥取藩の家老荒尾氏の家臣だった父・岩室宗賢と、鉄問屋の娘であった母・おりんとの間に生まれる。