However, a persistent semiconductor shortage remains a headache for Japanese firms such as automaker Toyota, which slashed its near-term output target this week, in addition to uncertainties around the Omicron variant.
Exports jumped 17.5% from a year earlier, Ministry of Finance data showed, outstripping a 16.0% gain expected by economists in a Reuters poll but below a 20.5% rise in November.
Yen-denominated exports and imports hit records of 7,881.4 billion yen ($69 billion) and 8,463.8 billion yen, respectively, biggest since comparable data became available in January 1979, largely as rising inflation affected both flows.
Steel exports rose 75.1% year-on-year by value, but the gain in export volume was 10.2%, suggesting soaring commodity prices pushed up values of made-in-Japan goods sold overseas.
Exports to China, Japan's biggest trade partner, grew 10.8% in December from a year earlier.
The led to a trade deficit of 582.4 billion yen ($5.09 billion) in December, versus expectations of 784.1 billion yen.
For the full year 2021, Japan reported a trade deficit of 1,472.2 billion yen, the first in two years and following a 388.3 billion surplus in 2020, amid higher fuel import costs.
Japan's economy is expected to have grown by an annualised 6.5% in the last quarter of 2021 thanks to a strong rebound in domestic consumption, according to a Reuters poll.
But policymakers have been wary of risks from the rapidly spreading Omicron variant, as Japan recorded its largest daily COVID-19 infections on Tuesday.
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