DUCT STRUCTURE

Provided is a duct structure having excellent sealing performance at a connection portion between a duct and a piping member. According to the present invention, a duct structure comprising a duct and a piping member is provided. The duct includes an opening in a tubular portion, and the piping member includes a piping portion. The piping portion is inserted into the opening and connected to the duct, and a foam rubber sealing material is disposed in a compressed state between an outer peripheral surface of the piping portion and an edge of the opening.