Yas Curry (map) is an Indian restaurant with in walking distance from the west exit of Oyama station. It has a decent lunch time buffet for 980YEN and the dinners are also reasonably priced.
Prasob Chai (map) is a delicious great priced Thai restaurant. By foot – it takes about 15 minutes from the west exit of Oyama Station.
Syouzuibo (map) is a great authentic Chinese Restaurant that is cheap and delicious. It is a 15-20 minute walk from the east exit of Oyama Station.