To provide an air curtain device and its housings capable of preventing degradation of heat insulating effect.

This air curtain device has a pair of housings 3R, 3L having supply openings 11R, 11L for supplying the air to the external and suction openings 13R, 13L for sucking the air inside, and air distributing portions 15R, 15L respectively disposed in the pair of housings 3R, 3L for distributing the air from the supply openings 11R, 11L, storing portions 21R, 21L, 23R, 23L for temporarily storing the air are disposed inside of the pair of housings 3R, 3L, the supply opening 11R and the suction opening 15R of one of the housings 3R are respectively opposed to the suction opening 15L and the supply opening 13L of the other housing 3L, and the air supplied from the air distributing portion 15R is circulated successively to the suction opening 13L, the supply opening 13L and the suction opening 13R from the supply opening 11R.