April 10, 2026

Microsoft to Invest $10 Billion in Japan to Strengthen AI and Data Sovereignty

Partnership with SoftBank and Sakura Internet Signals Major Push for Domestic AI Infrastructure

wolterke - stock.adobe.com

Microsoft announced on April 3 that it will invest US$10 billion, approximately ¥1.6 trillion, in Japan over the next four years to expand its data centers and artificial intelligence infrastructure. The investment marks one of the largest commitments ever made in Japan by a foreign data center operator.

During a visit to Tokyo, Microsoft President Brad Smith met with Prime Minister Sanae Takaichi to outline the company’s investment plan through 2029. Smith said Microsoft would work with SoftBank and Sakura Internet to build AI and cloud infrastructure in Japan.

The initiative reflects growing global concern over “data sovereignty,” the practice of managing sensitive data domestically to ensure economic security and regulatory stability. Japan is increasingly seeking to ensure that critical AI-related data can be processed and stored within the country rather than overseas.

Under the partnership, SoftBank and Sakura Internet are expected to jointly develop an AI cloud platform connected to Microsoft’s Azure cloud service. Data processing would be handled domestically through facilities operated in Japan, helping strengthen local AI capabilities and government compliance standards.

Microsoft also plans to upgrade its data centers in eastern and western Japan by adding advanced AI semiconductors and related equipment. The company aims to support the broader adoption of autonomous “AI agents,” which require massive computing power and high-speed data processing.

Beyond infrastructure investment, Microsoft said it will collaborate with five major Japanese companies, including Hitachi and SoftBank, to help train 1 million AI developers in Japan by 2030. The company will also partner with Japanese government agencies on cybersecurity initiatives.

Japan’s data center market is expected to grow rapidly as AI adoption accelerates. According to the Japan Electronics and Information Technology Industries Association, the domestic data center market is projected to reach ¥5.65 trillion by 2030, representing an increase of roughly 30 percent compared with 2025.

Other major U.S. technology firms are also ramping up investment in Japan. Oracle has announced plans to invest US$8 billion by 2033, while Amazon Web Services plans to invest roughly US$15 billion between 2024 and 2027.

However, the rapid expansion of AI infrastructure also raises concerns about electricity demand and energy security, as AI data processing consumes far more power than conventional software systems.