A coat drying device configured to dry coated film coated onto a continuously transported coating object, wherein the coating object comprises a first part and a second part having a greater heat capacity than a heat capacity of the first part, and at least the first part and the second part are conveyed by the same coating platform, and the coat drying device comprising: a drying furnace inside of which the coating object is conveyed; a heating means comprising a hot air outlet and a hot air deflection means, the heating means heating the coating object by supplying hot air into the drying furnace and blowing out the hot air from the hot air outlet to the inside of the drying furnace; and a heating control means that controls the heating means according to a heat capacity of the coating object, wherein the coat drying device further comprises a position detecting means that detects a position of the first part and a position of the second part, and an airflow direction control means that controls the hot air deflection means according to a position of the coating object, and the airflow direction control means controls the hot air deflection means to deflect the flow direction of the hot air that is blown out from the hot air outlet, based on the detection result of the position detecting means and a position of the hot air outlet, characterized in that the hot air deflection means is provided in a vicinity of the hot air outlet and deflects a flow direction of the hot air that is blown out from the hot air outlet, and the heating control means controls the heating means such that, when heating the second part of the coating object that is conveyed, the flow direction of the hot air that is blown out from the hot air outlet is deflected from the first part to the second part to supply the hot air with a greater amount of heat than an amount of heat of the hot air that is supplied to heat the first part. a drying furnace inside of which the coating object is conveyed; a heating means comprising a hot air outlet and a hot air deflection means, the heating means heating the coating object by supplying hot air into the drying furnace and blowing out the hot air from the hot air outlet to the inside of the drying furnace; and a heating control means that controls the heating means according to a heat capacity of the coating object, wherein the coat drying device further comprises a position detecting means that detects a position of the first part and a position of the second part, and an airflow direction control means that controls the hot air deflection means according to a position of the coating object, and the airflow direction control means controls the hot air deflection means to deflect the flow direction of the hot air that is blown out from the hot air outlet, based on the detection result of the position detecting means and a position of the hot air outlet, characterized in that a position detecting means that detects a position of the first part and a position of the second part, and an airflow direction control means that controls the hot air deflection means according to a position of the coating object, and the airflow direction control means controls the hot air deflection means to deflect the flow direction of the hot air that is blown out from the hot air outlet, based on the detection result of the position detecting means and a position of the hot air outlet, characterized in that the hot air deflection means is provided in a vicinity of the hot air outlet and deflects a flow direction of the hot air that is blown out from the hot air outlet, and the heating control means controls the heating means such that, when heating the second part of the coating object that is conveyed, the flow direction of the hot air that is blown out from the hot air outlet is deflected from the first part to the second part to supply the hot air with a greater amount of heat than an amount of heat of the hot air that is supplied to heat the first part.