PURPOSE: To suppress the propagation of noise into each space gap and drastically reduce the intrusion of the floating dust into a living space, as for a house which has an external heat shielding structure and permits the flowing of air in a continuous space.

CONSTITUTION: As for a house A which has an external heat shielding structure and has a living space 2, attic space 1, other outer wall, and inner wall as continuous space, a soundproof layer 8 is formed on the inner wall 19 between the living spaces 2, and at least one surface of the obverse surface of the continuous gap side surface between a heat shielding layer 4 and the inner wall 19 is formed to an uneven shape. Further, a heat exchange type ventilating fan 2 which exists in the attic space 1 is enclosed by a soundproof box 19, and a central dust collecting mechanism 31 is connected with the living space 2, and a sanitary living environment which is quiet and free from the floatation of dust can be realized.