"The recovery of the US economy, seen in its healthy new car sales, is contributing to the surplus," said Satoshi Osanai, economist at Daiwa Institute of Research.
Japanese stocks retreated for a fifth straight day on Monday.
The Nikkei 225 declined 1.47%, or 142.19 points, to 9,546.26, while the broader Topix retreated 1.46%, or 12.02, to 813.69.