Rear console duct air flow of an air conditioner for a vehicle is provided. An inlet of the rear console duct which is in fluid communication with a rear console register is located at a position where conditioned-air which passes through an evaporator and a heater core flows. The inlet of the rear console is always opened such that the conditioned-air is always introduced into the rear console duct when the air conditioner is operated. A guide member, which guides the conditioned-air to the rear console register through the rear console duct, is disposed between the rear console duct inlet and a face duct inlet that is in fluid communication with a face register. An end of a face door selectively contacts the guide member selectively contacts the guide member when the face door makes a turning movement.