Snapping its four-session rising streak, the 30-share barometer declined by 66.26 points, or 0.34 per cent, to 18,974.69, with stocks of realty, consumer durables and banking sectors leading the fall.
The index had gained nearly 360 points in the previous four sessions.
Similarly, the wide-based National Stock Exchange index Nifty moved down by 20.20 points, or 0.35 per cent, to 5,727.90.
Brokers said profit booking by participants after four sessions of gains and a mixed trend in the Asian region, mainly marred the trading sentiment here.