Oiwa began riding at the age of 10. Initially, equestrian sport was a hobby for him. By age 14, he started riding daily and participating in show jumping competitions. His first experience with eventing came during a university competition where he had to compete in all three disciplines.

Professional Journey

Oiwa's professional journey took a significant turn when he moved to England in 2001 after being inspired by the 2000 Olympic Games in Sydney. He later relocated to Germany following the 2008 Olympic Games in Beijing. He has been training under Dirk Schrade since 2009.

Achievements and Honours

One of Oiwa's most memorable sporting achievements was competing at the 2005 Badminton Horse Trials in England. He has received the Best Athletic Award in the equestrian section at the Japanese Sports Awards in 2005, 2007, and 2011.

Personal Life

Oiwa resides in Germany with his wife Reiko Takeda and their two children, including son Takamune. His wife represented Japan in equestrian jumping at the Olympic Games in 2012 and 2016. Oiwa is fluent in English and Japanese.

Challenges and Injuries

In 2011, Oiwa faced a significant setback when he fractured two ribs and damaged his lung and liver. Despite this, he continued to pursue his passion for equestrian sports.

Family Legacy

Oiwa comes from a family with a rich sporting legacy. His aunt Mieko Fujimori competed as a figure skater at the 1962 World Championships, while his uncle Hiroshi Ishii won a silver medal in swimming at the 1960 Olympic Games in Rome.

Retirement Considerations

After the 2012 Olympic Games in London, Oiwa considered retiring from the sport. However, Tokyo's successful bid to host the 2020 Games motivated him to continue his career. He viewed it as his fate and mission to compete on home soil.

Philosophy and Hobbies

Oiwa believes it is important to know one's qualities. Outside of equestrian sports, he enjoys fishing, listening to music, and driving.

Future Plans

Looking ahead, Oiwa plans to continue competing and contributing to the sport of equestrianism. His dedication and passion for the sport remain unwavering as he aims for further success on the international stage.