In 2009, Miyazaki Rio joined UP-FRONT KANSAI after passing an audition.
In 2010, Miyazaki became a member of the idol group Pizza♥Yah!.
In 2013, Miyazaki formed a three-member group named Lovelys!!!! with the duo Yes Happy! as a result of their joint lives together. Miyazaki became the leader of Lovelys!!!! and subsequently left Pizza♥Yah!, but continued her solo career while Yes Happy! also pursued their own activities.
After Yagi Saki joined Lovelys!!!! as a fourth member in June 2014, Miyazaki gradually decreased her solo activities to focus on the group.
- Name: Miyazaki Rio (宮崎梨緒)
- Nickname: Riitan (りーたん)
- Birth Date: August 26, 1994
- Birthplace: Osaka, Japan
- Blood Type: A
- Height: 150cm
- Pizza♥Yah! (2010-2013)
- Lovelys (2013-)
- Lovelys Member Color:
- Hobbies: Listening to music (Hello! Project, K-pop)
- Special Skills: Piano, cooking
- Favorite Activities: Singing, dancing
- Motto: Yareba dekiru! (やればできる！; You can do it!)
- [2014.04.14] candy pop love / Tulip (candy pop love/チューリップ)
-  Harukanaru Toki no Naka de 6 Gaiden ~Tasogare no Kamen~ (daily guest role)
- She likes western music, especially Michael Jackson.
- She loves singing and dancing and would like to try acting.
- She has the same last name as former Juice=Juice leader Miyazaki Yuka.