There is provided a catalyst for dimethyl carbonate synthesis which has a high conversion rate under the supercritical condition of CO2 and can be handled easily. The catalyst for dimethyl carbonate is obtained by loading SO42− or PO43− on a carrier composed of a compound having a solid acid site, and is used to produce dimethyl carbonate from acetone dimethyl carbonate and CO2 in a supercritical state. The component having a solid acid site is preferably one or more of ZrO2, Al2O3, and TiO2.