Apparatus for gasifying a solid fuel that supplies a solid fuel such as coal by dry condition to a gasification furnace of an entrained-bed type is constructed so as to be able to collect the char discharged from the gasification furnace and re-supply the char to the furnace without using a lock hopper and without changing the char into slurry form.The char discharged from the gasification furnace along with produced gases 53 produced in the gasification furnace is brought into contact with water by a gas cooler 9 and collected. After being dehydrated by a dehydrator 10, the collected char is loaded into a mill 2 or a raw-coal bunker 1. For loading into the raw-coal bunker 1, the char is dried by a drying machine 14, preferably, after the dehydration.According to the present invention, a mixture of the collected char and water can be re-supplied to the gasification furnace without using a lock hopper or a dry feeder. After being dehydrated, the char preferably is further dried and then supplied to the gasification furnace. Since a great deal of moisture is not supplied to the inside of the gasification furnace, it is possible to prevent a temperature of the gasification furnace from decreasing, and thus improve gas conversion efficiency.