The invention relates to an air duct for allowing cooling air to flow toward an electronic equipment, and provides the air duct for allowing cooling air to flow installed in a space in the equipment and also provides an electronic equipment using the same air duct. The air duct is structured to be formed of an elastic material, and has a duct body, a ventilation paths an intake part, and an exhaust part. The duct body is detachably installed in a space of an interior of the equipment, and the ventilation path through which air passes is formed in the duct body, and an intake part for taking air in the ventilation path and an exhaust part for exhausting air through the ventilation path are formed respectively in the duct body.