Japan's machinery orders posted their biggest single-month fall in six months in August as pressure from a global economic slowdown and a weaker yen that pushes up import costs darken the outlook for corporate spending.

The Reuters Tankan survey separately showed that business confidence at big manufacturers fell to a five-month low, as a double whammy of inflation and slowing global growth hurt the trade-reliant economy.

Core orders, a highly volatile data series regarded as a barometer of capital expenditure in the coming six to nine months, fell 5.8% in August from the previous month, Cabinet Office data showed.