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Miyano started his seiyū career in 2002 providing the voice of Riku, in the Japanese version of the PlayStation 2 video game Kingdom Hearts. He then voiced Kiba, the main character of anime series Wolf's Rain. He returned as the voice for Riku in 2004 Game Boy Advance game, Kingdom Hearts: Chain of Memories. He voiced Riku two more times for Kingdom Hearts II and Kingdom Hearts Re:Chain of Memories, in years 2005 and 2007 respectively.

In 2006, Miyano voiced Light Yagami for the anime version of manga, Death Note. In 2007, for his role as Light Yagami, he was nominated for two awards at the first Seiyu Awards: "Best Lead Actor Award" and "Best New Actor Awards". In 2008, Miyano went on to provide the voice of Setsuna F Seiei, the main character of Mobile Suit Gundam 00. He won his first award, "Best Voice Actor", at the 2008 Tokyo International Anime Fair for his portrayal of Light Yagami and Setsuna F Seiei. In 2008, Miyano took on the role as Setsuna F Seiei again, for the second season of Mobile Suit Gundam. He won his first Seiyu award, for the roles of Setsuna F Seiei and Hakugen Rikuson in Kōtetsu Sangokushi.


Signed to King Records, Miyano debuted in May 2007 with the single, "Kuon" (久遠 ,lit. Eternity?), which was used as the ending theme song for anime series Kōtetsu Sangokushi. The single debuted at #47 on the Oricon charts. He then released his second single, "Discovery", in 2008 which was the intro song for PlayStation 2 video game, Fushigi Yūgi: Suzaku Ibun. The song debuted at the #24 position on the chart. In August Miyano released his first character single, "Soup/Hakosora", under the name Mamoru Miyano comes across Setsuna F Seiei (宮野真守　ｃｏｍｅ　ａｃｒｏｓｓ　刹那・Ｆ・セイエイ ?). The single debuted on the chart at #18. In December he released his third single, "...Kimi e" (…君へ ,lit. ...To You?), which debuted at #18 on the charts. Miyano released his debut album, Break, on March 11, 2009.

Miyano will embark on his first tour, 1st Live Tour 2009: Breaking, starting on April 11, 2009 and is scheduled to end on April 26, 2009.


Miyano's first acting job was in 1992 in Tokusou Exceedraft, where he appeared in a flashback as a child in a Yakuza member past. In 2003, Miyano joined the cast of The Prince of Tennis Musical playing Tetsu Ishida (石田 鉄 ,Ishida Tetsu?). He made his film debut in 2006's The Prince of Tennis.