Robot assembler work on cars during the assembly process at Nissan Motor Company's Kyushu Plant on November 23, 2007 in Kiyakyushu, Japan.
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Japan's industrial output fell 2.3 percent in May, government data showed on Thursday, in a sign companies could be worried that export demand is weakening.
The fall was more than a median estimate for a 0.1 percent decrease in a Reuters poll of economists.
Manufacturers surveyed by the Ministry of Economy, Trade and Industry expect output to rise 1.7 percent in June and increase 1.3 percent in July, data showed.