Dealers said RBI action was missing in forex market even as rupee continued its free-fall for the fifth day in a row.
They also said the rupee breached the 57 level because of strong dollar demand from oil importers in the wake of crude falling to near 18-month low of $90 a barrel levels.
Union Bank of India, Treasury Head, V J Mhatre, said, "Apart from oil importers, there was also news that some corporate houses have bought dollar for FCCB repayment."
At the Interbank Foreign Exchange (Forex) market, the domestic unit opened lower at 56.80. Later, it plunged to life-time low of 57.31 before recovering some ground to end at 57.15, a fall of 85 paise or 1.51 per cent from last close of 56.30.
As rupee touched its record low of 57.37 a dollar, Finance Secretary R S Gujral in New Delhi said, "Government (is taking)
Buy half of dollars from a PSU bank: RBI to oil cos
RBI, govt taking steps to stop the Re from sinking
Now, NRIs can send money home more frequently
Re hits all-time low of 56.57