Yoshihiro was a swordsmith of the Senjuin school, regarded as the oldest lineage among the Five Schools of Yamato. The group takes its name from the Senjudo hall enshrining Senju Kannon at the western foothills of Mount Wakakusa in Nara. According to old transmitted writings, master smiths Yukinobu and Shigehiro were active in the late period, though no secure extant examples by either have been confirmed. Yoshihiro is placed in the period, with reference works recording his activity around the Bunwa era (1352-1356). He signed with both two-character and longer inscriptions; a dated bearing the inscription "Senjuin Yoshihiro of Soegami District in Washu; on a day in the eighth month of Bunwa 2" firmly establishes his working period, while a signed dated Koei 2 (1343) constitutes especially valuable reference material. Extant signed works by this smith are extremely rare, and in any form they remain among the scarcest in the Yamato tradition.
Within attributions for the Senjuin group, there has from old times been a tendency to apply Yoshihiro's to those works in which the - character is felt to be especially strong. His signed works substantiate this association: the Bunwa 2 displays an exuberant with powerful , in a manner of workmanship that calls works to mind. His blades characteristically forge mixed with tending toward , with fine adhering densely and entering throughout. The ranges from narrow with deep and thick to bold -ba, but in all cases the shows minute and uchi-noke, while and appear vigorously within the . The commonly finishes in , at times becoming flame-like in style. Among Yamato works of the period, his blades display some of the greatest variation in both and , with abundant and a notably strong presence of .
Yet Yoshihiro's range extends beyond the -inflected manner. Certain attributions present a calmer temperament with a relaxed and gentle habataki, where both and are thickly covered with and the shioai is deep. The forging that frequently incorporates is praised as excellent, and the internal activity of and is rich and splendid. As a smith for whom extant signed works are vanishingly few, each authenticated example possesses high documentary value. Whether in the vigorous form or the more restrained manner, his works are recognized as suffused with an antique fragrance and overflowing with dignity.