Japan's core private-sector machinery orders, a key gauge of corporate capital spending, slid to their lowest in almost three years in March, with manufacturers predicting more declines ahead, adding to worries that flagging capital spending will stymie growth.

But the data, which came a day ahead of the release of first-quarter growth figures, did little to change the view that the Bank of Japan would keep the nation's already low interest rates unchanged at 0.5 percent for coming months.