A defrosting apparatus includes: a heating unit including a heater case and a heater, where the heater case defines an inner flow path having an inlet and an outlet at ends thereof, and the heater is mounted in the heater case to heat a working fluid within the inner flow path; and a heat pipe inserted into the inside of the heater case through the inlet and the outlet, and which has at least a part thereof disposed to be adjacent to a cooling pipe of an evaporator such that heat is radiated to the cooling pipe of the evaporator by means of the working fluid at a high temperature that is heated by the heater and then is transferred, where the heater is configured to stop emit heat at a preset temperature or higher since an electric current is suppressed due to a sharp increase in resistance.