Vapor pressure of chlorine trifluoride was measured by a static-type apparatus from 300 K to 317 K with corresponding pressures from 0.1848 MPa to 0.3349 MPa. The uncertainty of the measurement was less than +/-0.03 K in temperature and +/-0.3 kPa in pressure. The purity of the sample was more than 99.9999 mass %. The vapor pressure at 313.15 K was-0.2947 MPa. The experimental data were correlated by the Antoine and Frost-Kalkwarf equations. The correlated deviations of both equations were less than +/-0.05%.