- Birth: 1473
- Death: 1512
- Distinction: Lord of Echizen
- Sons: Asakura Takakage, Asakura Kagetaka, Asakura Kagetoshi
Sadakage was the son of Asakura Ujikage, who passed away in 1486. He had first to contend with a short-lived rebellion that ensued as a result of his ascension (and assisted by his uncle Asakura Norikage, then worked to expand the Asakura domain, clashing with the Togashi of Kaga (1494, 1504), the ikko-ikki of Echizen, and the Rokkaku of Ômi.