Japan's much-battered economy has grown for the seventh quarter in a row thanks to continued demand for Japanese goods in China and the US.
Japanese firms are benefiting from strong export demand
For the three months to September, GDP was up 0.6% from the previous quarter, making an annual rate of 2.2%.
Economists said that domestic spending was also climbing, albeit at a slower rate than the impact of overseas trade.
The data will be good news for Prime Minister Junichiro Koizumi, re-elected last week with a shrunken majority.
"It's stronger than we thought it would be," Mr Koizumi told reporters.
His party's disappointing performance in Sunday's poll has widely been seen as a response to dissatisfaction with the slow pace of economic reform and of Japan's recovery from four recessions in little more than a decade.
Help from abroad
The spurt, the government's data showed, was largely a response to continued expansion in the US and China, both of whom are major buyers of Japanese goods.
Exports contributed a third of the growth, and economists said they believed the trend was set to stay for the next few months at least.
"With the US economy seen growing strongly, Japan's exports are likely to grow at a stable pace," said Ryota Sakagami, economist at Nomura Research Institute in Tokyo.
Domestic demand was less impressive, but business investment - which recent surveys have indicated is picking up - was doing better than some had feared, with spending on electronics, communications and automobiles showing healthy gains.
The growth news failed to produce much of a market reaction, with the benchmark Nikkei 225 falling 1.65% by the close.
Apart from anything else, the pickup in Japan - while reassuring - still leaves the country reliant on foreign countries whose own growth is far outstripping its own.
China, for example, could grow as much as 9% this year, and its currency is pegged at a low level against the dollar, making its own exports more competitive.
As for the US, the third quarter produced expansion that - if continued for a year - would amount to 7.2%, and the dollar itself is continuing to lose ground to a resurgent yen.
That has already hit the results and share prices of some Japanese exporters, including games company Nintendo.