To provide a column structure with a skid disposed at the end of a column to form a rotary part, which prevents the skid from being fixed to the column in an inclined manner or from being deformed such as being bent upward by stress of fixing.

A skid 41A to be fixed to the inner surface of the end of a column 2 comprises: a support wall 41A2U with a predetermined height vertically disposed at a part of its outer peripheral edge; and a reinforcement recess 41A3S with a predetermined shape disposed at a predetermined position on its top surface.