To install a shutter reinforcing column almost perpendicularly in a shutter central part even when the distance of a frontage in a shutter falls below nearly twice the upper and lower movable distance of the shutter.

A shutter reinforcing column guide rail to be fitted at the upper part is installed at the lower part of a shutter winding-up device or in a beam in the case of a warehouse, and one roller A of the shutter reinforcing column is rolled and put into the guide rail. A shutter reinforcing column guide rail to be fitted at the lower part or a shutter reinforcing column metal fitting is installed at the shutter lower part, and one side of the shutter reinforcing column is fitted to either the guide rail or the metal fitting. And when the shutter is raised/lowered, the rollers A,B move right and left so that the shutter reinforcing column stands when the shutter is lowered and the shutter reinforcing column becomes horizontal to be in a storage state when the shutter is raised.