Hiroshi Hoshina was born in 1936 in Tokyo. He studied composition at the Tokyo National University of Fine Arts and Music, where his thesis won the 1st prize of the Mainichi-Classic Competitions (composition for orchestra).

He composes various styles of classical music: orchestra work, brass band music, instrumental pieces, songs, choirs, opera, etc. Over a half of his works belongs in the brass band music, which includes some well-known pieces like "Fumon" and  "Caprice".
In 2009, a piece for solo horn and piano (originally composed for solo horn and orchestra) "Miko Dance" is chosen as a compulsory piece of the final round with piano at the 20° Concorso Internazionale "CITTÀ DI PORCIA".

From the beginning of his music career, teaching amateur musicians was one of the most attracting works for him. He has been a resident conductor of Okayama University Symphony Orchestra for over 40 years, which is a record period staying a position of resident conductor in Japan. During the close and continuous relationship with the orchestra, he developed a unique unified theory of musical analysis, interpretation, and playing methods. It works remarkably well for musicians that start playing instruments and yet have any professional training at conservatories: such as school brass bands, university orchestras and brass bands consist mostly of non-music course students, and amateur citizen orchestras and brass bands.
Based on the theory, he is also active as a conductor, clinician and author.

He taught at Tokyo Collage of Music, Aichi Prefectural University of Fine Arts and Music, and Hyogo University of Teacher Education where he retired in 2001.