The Yushun Himba (優駿牝馬), also known as the Japanese Oaks (オークス) is a Japanese Grade 1 flat horse race for three-year-old thoroughbred fillies run over a distance of 2,400 metres at the Tokyo Racecourse, Fuchū, Tokyo in May.

Tokyo Racecourse is located in Fuchū, Tokyo, Japan. Built in 1933 for horse racing, it is considered the "racecourse of racecourses" in Japanese horseracing. It has a capacity of 223,000, with seating for 13,750.