A paint baking oven is for a vehicle body that includes a body exterior part and a narrow portion. The paint baking oven bakes a wet coating film applied to a coated surface of the narrow portion. The paint baking oven includes a heat source, such as an infrared heater, a halogen heater, an induction heater, or a hot air generator, configured to give heat energy primarily to the coated surface of the narrow portion and a heat source mover configured to move the heat source toward and away from the narrow portion.