However, there are concerns that if the Bank is too aggressive it will trigger a dangerous rise in inflation.
Stuart Porteous, head of economics at RBS, said: "Is this the beginning of the end of the recession? While it looks like the first quarter may well be the worst of this downturn, any talk of recovery is premature.
"The Bank has emptied both its barrels, and it will be some months before we can judge just how successful it has been." Stephen Gifford, chief economist at Grant Thornton, said: "Today's decision is a welcome relief after all the unprecedented interventions of the last six months.
"Such a pause for breath will provide some balance and calm in the economy, and could begin to halt the doom and gloom."
King last month made clear that there was little scope for further rate cuts after its six-month scramble to shore up the economy. The Bank is worried that further cuts could deter banks from lending and hit savers.