He served as a member of the House of Representatives for the Liberal Democratic Party (LDP) between 2012 and 2016.
Born in Tokyo, Miyazaki was educated at Waseda University.
He went on to work at companies in the insurance and human resources industries.
In January 2016 he became the first representative in Japan to request paternity leave.
However, shortly before Kaneko was due to give birth to the couple's child, it was revealed he had had an affair whilst she was pregnant.