An air-conditioning duct (100) in a passenger car of transportation which is extended in a vehicle length direction (11) in a ceiling portion of the passenger car (10) utilized by the general public and receives conditioned air from an air-conditioning apparatus (180) regulating a temperature of the air to guide the conditioned air into an inside of the passenger car. The air-conditioning duct in a passenger car has a non-uniform distribution configuration which makes the discharge volume of the conditioned air from the air-conditioning duct into the inside of the passenger car different and non-uniform among the respective regions of the inside of the passenger car.
