The 30-share barometer declined by 77.03 points, or 0.38 per cent, to 20,083.79 with banking, consumer durables and capital goods stocks leading the fall. The index had gained nearly 487 points in the last three sessions.
Similarly, the wide-based National Stock Exchange index Nifty fell by 16.90 points, or 0.28 per cent, to 6,094.35.
Brokers said fresh selling by funds and retail investors, mostly of a profit-booking nature, and a mixed trend on Asian bourses influenced the trading sentiment.
In the Asian region, Hong Kong's Hang Seng index eased by 0.67 per cent, while Japan's Nikkei up 0.520 per cent in the opening trade today.
The US Dow Jones had ended 0.69 per cent higher in yesterday's trade.
