The , currently known as for sponsorship reasons, is a multi-sport venue located in Chà Âfu, Tokyo, Japan.
The main arena has a seating capacity of over 10,000, and also includes a swimming pool, a gym, a multi-use sports area and two fitness studios, that is available for use by the general public. It is the first new venue completed for Tokyo 2020. Construction took three and a half years and cost over $300 million to complete.
On February 14, 2025, Keio Corporation signed a 3-year naming rights for the venue until March 2028, and changed the name to Keio Arena Tokyo on May 1.
In October 2018, the venue hosted the Japan Open Tennis Championships as the Ariake Coliseum was renovated for the tennis events at the 2020 Summer Olympics. It was used for staging the 2020 Summer Olympics badminton tournaments and hosted the badminton, wheelchair fencing and wheelchair basketball competitions for the 2020 Summer Paralympics.