Koki Oshima is a professional footballer from JPN and is currently 30 years old. He is on the books of Ventforet Kofu and wears shirt number 29. His main role on the pitch is Forward. He measures 177cm in height and weighs 66kg. His stronger foot is Right. His estimated market valuation currently stands at 300K €.

His latest transfer saw him join Ventforet Kofu from Tochigi SC via Free on 2025-01-20.

During the J2/J3 100 Year Vision League 2026 campaign, Koki Oshima made 4 appearances, scoring 0 goals and adding 2 assists. He averaged 0 goals per match from 4 shots, with 0 on target.