Daishinbo Yukei is said to have been a son of Kunimitsu, and one tradition holds that he was the senior fellow apprentice (anideshi) of Yukimitsu. From ancient times he has been renowned as a master of blade carvings (), and it is conjectured that among works by Yukimitsu and Masamune there are carvings executed by his hand. No indisputably authentic signed work has yet been encountered, though a sasaho-form bearing a signature reading "Daishinbo" has been designated, with the concluding that this represents a different individual from the -period tradition.
The works attributed to Daishinbo display the principal characteristics of craftsmanship. The finest example (, 50th Session) shows an forging mixed with and , with "thickly adhering " and frequent , while the , founded on "a shallow mixed with ," contains deep , thick , and conspicuous and with slight . This piece retains an by Kotsune with a valuation of 350 issued in Enpo 4. A second attributed (, 22nd Session), transmitted in the Shimazu family, is accompanied by a black-lacquered gold hiru-maki preserving taste, itself previously designated .
What distinguishes the Daishinbo attribution is the union of blade and carving: the 50th Session bears an excellently executed relief of a and hitotsu-hitsuji , and the notes that "within the forging -- where appears frequently -- there is a discernible thread that calls to mind Kunimitsu." With no authenticated signed blades, Daishinbo remains an elusive yet consequential figure whose influence on later is deeply embedded in the tradition.