Maruyama was registered as an international referee from 1961 to 1976. He served as a linesman at the Olympic Games in Tokyo in 1964, and as a referee for the group match between Hungary and Ghana at the 1968 Olympic Games in Mexico City.

and

Maruyama was named as the first ever Japanese World Cup official for the 1970 FIFA World Cup in Mexico, where he served as a linesman (assistant referee) in two matches, including the group match between Peru and Bulgaria. Maruyama received a FIFA contribution award in 1979 after 15 years of being an international referee. Maruyama also served as a referee for a total of 62 matches in the JSL First Division (between 1965 and 1976).

after

After retirement Maruyama applied his rich experiences as a referee and position as a trainer to contribute to the development of football refereeing not only in Japan, but throughout Asia. He served as head of the JSL's disciplinary committee between 1985 and 2002.
He also coached the Chuo University from 1955, leading the team to many national titles. Maruyama was awarded the international volunteer award from the IOC and FIFA in 2001.