A surprise jump in capital spending powered the 1.6 per cent expansion in the world's number-three economy between January and March, slightly better than an initial estimate of 1.5 per cent.
It also marked the best quarterly advance since a 2.6 per cent rebound several months after the 2011 quake-tsunami disaster.
Cash registers across Japan rang up big sales ahead of the April 1 consumption tax rise, a move seen as crucial to paying down a massive public debt but which critics warn could throw a nascent recovery off track.
However, consumers have since reined in their buying, with figures this month showing household spending down 13.3 per cent in April while retail sales suffered a similar slump.
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Industrial production also slowed, exacerbating fears about the impact of higher sales taxes and renewing calls for more monetary easing by the Bank of Japan.
But fresh consumer confidence figures today afternoon showed that sentiment rose in May, the first improvement in six months and offering hope that domestic demand was holding up better than some had expected.
Also, current account figures for April offered some good news for the tourism industry as foreign visitors spent more money than Japanese holidaymakers travelling overseas for the first time since 1970.
The number of visitors to Japan in April surged 33 per cent to record 1.23 million as the country looks to boost arrivals ahead of the 2020 Tokyo Olympics.