Abstract: To provide a structure that can improve air permeability from a first space to a second space and can prevent a building structure from increasing in size. A wall 11 has: a body section 35 separating an outside A1 from a living space B1 of a building; a ventilation device 30 provided in the body section 35; and a first ventilation channel 24 and a second ventilation channel 25 provided in the ventilation device 30, the first ventilation channel 24 and the second ventilation channel 25 sending air in the outside A1 to the living space B1, wherein arrangement ranges L1 and L2 of the ventilation device 30 in a thickness direction of the body section 35 are within an arrangement range L3 of the body section 35, and a cross-sectional area of the first ventilation channel 24 in a plane perpendicular to a virtual line E1 indicating a center of the second ventilation channel 24 narrows as it approaches the living space B1 along the virtual line E1.

Abstract: A method for manufacturing a multihardness foamed article, including the steps of, placing a mold for foaming such that its bottom surface is inclined with respect to the horizontal plane, pouring a first liquid formulation which will form a portion having a certain hardness designed to constitute the surface area of the foamed article at or adjacent to a higher point of the inclined bottom surface, and allowing the formulation to flow and spread over the entire bottom surface as a continuous thin layer while sticking at its undersurface to the bottom surface, immediately after pouring of the first formulation, pouring a second liquid formulation which will form another portion of another hardness designed to constitute a portion other than the surface area of the foamed article at or adjacent to the higher point, and allowing the second formulation to flow and spread over the flowing and spreading first formulation as a second continuous thin layer which will not commingle with the first layer, and allowing