wall construction is flat therefore it is possible to attach waterproof paper 15 to the structural members and the bearing wall panel 10 without concerning about a step at a junction between the bearing wall 31 and the non bearing wall 30 a regarding furring strips 13 that are necessary for attachment of an exterior building material 16 it is possible to use furring strips 13 of the same thickness for both the bearing wall 31 and the non bearing wall 30 a therefore it is possible to attach the exterior building material 16 without concern for the step or unevenness at the junction between the bearing wall 31 and the non bearing wall 30 a it should be noted that the above described non bearing wall 30 a is illustrated using a building frame of a conventional example shown in fig1 to 15 next a bearing wall 31 b according to embodiment 2 of the present invention will be described with reference to fig5 to 8 vent portions 19 formed in a receiving member 8 is provided by forming paths penetrating an interior face and an exterior face of the receiving member 8 in order to allow airflow between the interior side and the exterior side with respect to the shape of the vent portions.