PROBLEM TO BE SOLVED: To provide a snow melting device of multi-span type vinyl house at a low cost.SOLUTION: The snow melting device 100 of multi-span type vinyl house includes: a hot water boiler 20； a chimney 30 disposed along a valley part 16 of a roof 12； a chimney holding member 32 for holding the chimney 30； an exhaust fan 60 for promoting the discharge of an exhaust gas from the hot water boiler 20 in the chimney 30； and a hot water pipe 40 for supplying hot water to a radiator 50 disposed in the vinyl house 10. The hot water pipe 40 includes: a first path 42 which returns to the hot water boiler 20 immediately after the hot water from the hot water boiler 20 is passed through the radiator 50； and a second path 44 which is extended to be parallel to the chimney 30 on the roof 12 located at the upper side of the chimney 30 and then returns to the hot water boiler 20 after the hot water from the hot water boiler 20 is passed through the radiator 50.
