It is installed in the entrance door, thereby forming the sun shade indoors and outdoors with air by using air produced by air curtain. Even given opening the entrance door, the indoor and outdoor temperature can be maintained consistently. Inconvenience according to opening and closing the door is removed. The entrance and exit in equipments and people are free. It blocks air current, smoke, dust, smell, and worms outside the room. Given air conditioning, energy is reduced. It is the device that gives a user a feeling of comfort.