She was born at Shimokata in Kuroi-jo Castle (Kozen-ji Temple in the city of Tanba) of Tanba province (comprising modern-day Hyogo and Kyoto Prefectures), which is where her father's territory was then located.
春日局は、その当時父の所領のあった丹波国（現・兵庫県および京都府）の黒井城下館（興禅寺(丹波市)）で生まれる。