She graduated from the private Horikoshi High School, and made her film debut in the 1983 release Aiko 16-sai, and was selected as the 11th Clarion Girl in 1985.

Miyazaki has appeared nude in multiple films, including XX Utsukushiki Kyōki (ＸＸ美しき凶器) and Yaneura no Sanposha (屋根裏の散歩者).

She has also released nude photo books and appeared in the Japanese edition of Playboy.

In 1996, Miyazaki married and ceased work on her entertainment career.

In November of that same year, Miyazaki announced that she had breast cancer.