Keio Jr. Winter Cup 2026-27 to be held at Keio Arena TOKYO in January 2027

The Japan Basketball Association (JBA) will host the 2026-27 Jr. Winter Cup at Keio Arena TOKYO in Chofu, welcoming 96 teams to the seventh annual national U15 championship.

The tournament is scheduled to run from January 4 through January 8, 2027.

The championship will feature 48 boys’ teams and 48 girls’ teams competing in a knockout tournament format. All games are set to take place at the facility known as Musashino Forest Sport Plaza, officially designated as Keio Arena TOKYO for the duration of the event.

The JBA confirmed the schedule, which serves as a cornerstone of their youth development calendar alongside the U18 Winter Cup and the national mini-basketball tournament for the U12 age group.

Keio Electric Railway Co., Ltd. has signed on to serve as the title sponsor for the event, continuing a partnership from previous years. The association said that this collaboration extends to their support for the SoftBank Winter Cup 2026 and the 58th McDonald’s National Mini-Basketball Tournament.

According to the JBA, this ongoing financial and logistical support is intended to improve the competitive environment for athletes ranging from elementary school students to high schoolers aiming for national-level play.

Fans can follow the action through live streaming provided by Basketball LIVE. The governing body said that further details regarding additional broadcast or distribution platforms will be released as they are finalized. Official updates and tournament brackets will be maintained on the event website throughout the competition.

The tournament is organized and managed by the Japan Basketball Association. As of November 13, 2026, the Tokyo Basketball Association is providing operational cooperation, with additional support from Nikkan Sports Holdings. Corporate sponsors for the 2026-27 edition include Jordan Brand, Molten Corporation, The Asahi Shimbun Company, Japan Sigmax Co., Ltd., and SoftBank Corp.