The 1.0 per cent expansion in January-March - or 3.9 per cent on an annualised basis -- was sharply up from an initial estimate of 0.6 per cent growth, according to the Cabinet Office figures.
The upbeat data is good news for Tokyo's efforts to boost the economy, but household spending remains stubbornly weak as the Bank of Japan struggles to push up prices in a bid to end decades of deflation.
The rise hammered consumer spending and pushed the economy into a brief recession. Japan limped out of the red in the last three months of 2014 with today's surprise figures offering some hope for better times ahead.
"The figures show the Japanese economy is gradually heading for recovery," said Credit Suisse economist Takeshi Saito.
Corporate investment rose 2.7 per cent from the previous quarter, well above an initial 0.4 per cent expansion.
"At the moment, (the Bank of Japan) is less likely to introduce another round of monetary easing," Saito said.
However, bank chief Haruhiko Kuroda has been forced to push back a timeline for hitting a 2.0 per cent inflation target - a cornerstone of Prime Minister Shinzo Abe's plan to kickstart the deflation-plagued economy - although he insists that healthy price rises are around the corner.
In Asian forex trading, the dollar was slightly lower at 125.44 yen, against 125.56 yen on Friday in New York where the US currency climbed briefly to a 13-year high of 125.86 yen.
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