PROBLEM TO BE SOLVED: To provide a support structure of a cutoff member being high in structural strength by properly transmitting force to the cutoff member.SOLUTION: In a support structure of a cutoff member 5 having a specific height in the vertical direction and supporting the cutoff member 5 for blocking up a passage by a support body, the support body comprises a support member for providing the cutoff member 5 on one side surface and supporting the cutoff member 5, a structural wall having a structural material provided in the vertical direction and the horizontal direction as a core material, connected to the other side surface on the opposite side of the one side surface among the support member and extending in the direction for crossing with the support member and a connection member provided over the support member and the structural wall and fixed to the respectively support member and structural wall.SELECTED DRAWING: Figure 4
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