After graduating from the Tokyo University of Education, he played for Kyodai Club which consisted of his alma mater Tokyo University of Education players and graduates.
In March 1954, when Muraoka was a Tokyo University of Education student, he was selected in the Japan national team for 1954 World Cup qualification.
[1] After retirement, Muraoka became a journalist for Kyodo News and worked until 1991.
On March 13, 2017, Muraoka died of heart failure in Kodaira at the age of 85.
This biographical article related to a Japanese association football goalkeeper is a stub.