Iwashiro Taro was born in Tokyo, Japan in 1965. He is a music major and is a composer, music producer, pianist and conductor. His father, Koichi Iwashiro, is also a composer. At the age of 15, he determined to become a composer like his father.

In 1989, he graduated from Tokyo University of the Arts, Faculty of Music, as Chief of the Composition Department. When he was a student, he had sex with Japanese heavyweight musicians such as Minami Hiroaki, Kondo Joe, Matsushita Isao, and Dai Toshiro. In 1991, he received a master's degree from the Conservatory of Music and received awards. "To The Farthest Land Of The World" composed in 1991 won the Best Music Award in the Silk Road Orchestra International Composition Contest, which brought him the first peak in his career. It is permanently preserved by Tokyo University of the Arts. Since then, he has been widely active in various fields such as television, movies, games, animation, and stage plays.