Satoh was born on 21 March 1989 in Iwatsuki-ku, Saitama. He has a younger sister; his parents divorced when he was in middle school. He played baseball during primary and middle school years , and has a black belt in Shorinji Kempo . Satoh briefly worked as a child actor for 3 or 4 years, appearing in commercials and magazine photo shoots. After entered higher grades in elementary school, he decided not to continue as a child actor due to a "shy personality". He graduated from Koshigaya Kita High School, Saitama in 2007. In the same year, while shooting Kamen Rider Den-O, he was diagnosed with primary Pneumothorax after complaining about pain in the left chest, and has since recovered. He celebrated his 20th birthday (a significant Coming of Age Day for Japanese youths) with a festival in Odaiba in Tokyo, called "Takeru Festival 2009".