On top of a slowdown in Australia's lucrative mining sector, consumer sentiment in the country appears to have deteriorated sharply, posing a challenge to the central bank which cut interest rates to a record low earlier this month.

The Westpac-Melbourne Institute's index of consumer sentiment fell 7 percent month on month in May accelerating from the 5.1 percent decline in April. The poll of 1,200 people was conducted between May 13 and 18.