Japan's economy grew an annualized 2.1% in the first quarter, according to the first preliminary figures from the Cabinet Office.
The latest print beat market expectations for a 1.7% increase, according to a Reuters poll.
The world's fourth-largest economy grew 0.5% on a seasonally adjusted basis during the quarter, better than the revised 0.2% increase in the previous quarter.
Domestic demand saw an annualized rise of 1%, with private demand, accounting for over half of Japan's GDP, increasing by 0.8%.
Exports of goods and services rose 7.1%, while imports edged up 1.9%.