The present invention relates to a method for producing propylene oxide, characterized in that peroxide is reacted with propylene in the presence of a titanosilicate catalyst which has an X-ray diffraction pattern of the values indicated below and is represented by the formula. xTiO2·(1−x)SiO2 (In the formula, x denotes a numerical value of 0.0001 to 0.1.) X-ray diffraction patterns (interplanar spacing of lattice d/Å) 13.2±0.6 12.3±0.3 11.0±0.3 9.0±0.3 6.8±0.3 3.9±0.2 3.5±0.1 3.4±0.1.