Equity benchmark Sensex declined 87 points on Monday, tracking losses in index majors HDFC Bank, ICICI Bank and Reliance Industries amid a weak trend in global markets. The 30-share BSE index ended 86.95 points or 0.17 per cent lower at 49,771.29. The broader NSE Nifty dipped 7.60 points or 0.05 per cent to 14,736.40.