The BSE benchmark Sensex declined by almost 104 points in early trade today. The 30-share barometer, which had gained nearly 540 points in the previous three sessions, fell by 103.91 points, or 0.59 per cent, to 17,493.51 with metal, banking, capital goods, realty and consumer durable sector stocks coming under pressure. The wide-based National Stock Exchange index Nifty also shed 34.05 points, or 0.63 per cent, to 5,324.45.