Ippei Yasushiro was born in Enpo 8 (1680) in Kirei District, Satsuma Province, as the eldest son of Ippei Yasusada. His common name was Tamaoki Koichi. He first learned the methods of forging under his father and later studied under Yamato no Kami Yasukuni of the main Naminohira line. In the first month of Kyoho 6 (1721), together with Masakiyo of the province, he was summoned by the eighth shogun Tokugawa Yoshimune and forged swords at the Ohama Palace in . His skill was recognized, and the bakufu granted him permission to carve the ichiyō aoi crest upon the ; on his return journey he was further appointed Shume-no- by the Imperial Court. He died in Kyoho 13 (1728) at the age of forty-nine. Together with Masakiyo, he stands as one of the "twin pillars of Satsuma ." Where Masakiyo excelled at varied mixing with and , Yasushiro more often tempered calm in a gentle -tinged manner.
Yasushiro's is characteristically a tightly forged with thickly adhering and prominent . His presents a -based temper — often described as with shallow — in which the is deep and adheres well, frequently mixed with coarse-grained . Through this temper run and thick , together with ; these long, trailing formations are referred to in the Satsuma tradition as imozuru (yam-vine), a hallmark effect closely identified with his work. The is characteristically bright and clear. His tends toward , turning back in a rounded manner, often showing vigorous at the tip. In , his blades display a somewhat wide with a high , thick , and ample , producing a stout and imposing form with a weighty feel in hand. The is consistently with and .
The consistently places Yasushiro among the foremost masters of the Satsuma tradition, describing him and Masakiyo as the "two great masters" who together represent its highest achievement. His works are praised for bringing forth "the smith's distinctive traits without omission," with both and described as bright, clear, and — sound and well-preserved. The quality of his and is noted as excellent even when the overall character is subdued, and his finest pieces are singled out as showing "an especially outstanding level among this smith's productions." Early works bearing a four-character signature are recognized as comparatively rare and of significant documentary value for understanding his formative style. Blades bearing Ohama Goten forging inscriptions and date markings constitute valuable reference material for the study of the shogunal commissions. Across the designated corpus, the recurring assessment is one of dignified, imposing craftsmanship in which calm temperament and powerful activity are united with characteristic clarity.