The warehouse can be set up as a pillarless large space that is effective for free placement and movement of large stored items. This is a mega-class warehouse with a frontage of 30 to 50 meters and a floor area of 1,500 m2 or less, or up to 3,000 m2 or less depending on the items to be stored, and is a general membrane structure in compliance with Notification No. 666 of the Building Standard Law. The pillar-less space, which is difficult to achieve with conventional construction methods, allows for a high degree of freedom in the movement of stored items, as well as in changing the storage arrangement according to the situation, to realize a highly flexible business space.