Sato Atsuhiro was born on August 30, 1973. When he was in his 3rd year of primary school, during the 2nd term, he moved to Fujisawa, Kanagawa. In 1986, aged 13, he joined Johnny's Entertainment as a "scholarship student" instead of passing an audition. The following year, he debuted with Hikaru GENJI where he was the youngest member. At the time, he was still in junior high, so he still had to attend classes so he was sometimes absent from Hikaru GENJI appearances. His catchphrase at the time was "超新星からのメッセージ" ("Message from a supernova").

In 1995, Hikaru GENJI SUPER 5 disbanded and he changed his name to アツヒロ サトウ (Sato Atsuhiro) and released his first solo single. He also released two albums under that name, then released his last album under his real name. In 1998, he changed his name to 佐藤アツヒロ (Sato Atsuhiro), his current name.

He is one of the more popular "senpais" in the company, younger members often mention hanging out with him. Domoto Tsuyoshi (KinKi Kids) joined the company because he admired him. He is also a member of the unofficial Johnny's group NO BORDER (other members include Yamaguchi Tatsuya (TOKIO), Domoto Koichi (KinKi Kids), Matsumoto Jun (Arashi), Takizawa Hideaki (Tackey & Tsubasa), Yamashita Tomohisa (NEWS), Murakami Shingo (Kanjani8), Ikuta Toma (junior)). Edit Biography