A particulate matter sensor is provided. A particulate matter sensor according to an exemplary embodiment of the present invention comprises: an insulating substrate; a first electrode unit that is formed on a surface of the insulating substrate and that includes a rim electrode, and a plurality of spaced electrodes that are not electrically connected to the rim electrode; a second electrode unitthat is disposed inside the insulating substrate and spaced apart from the first electrode unit, and that includes a plurality of capacitor electrodes wherein the capacitor electrodes are electricallyconnected to one another so that capacitance of the first electrode unit can be measured; and a heater unit that is disposed inside the insulating substrate and that provides heat for removing particulate matter deposited on a sensing unit, wherein the spaced electrodes include the sensing unit on which particulate matter is deposited and a capacitor unit for measuring capacitance, the spaced electrodes and the rim electrode are electrically connected when particulate matter is deposited, and thereby the capacitance between the first electrode unit and the second electrode unit can be measured.