PURPOSE: To make correction of steel column uneveness most suitably by composing a correction device piece with a gripping unit and an adjuster holding unit equipped with the adjuster and installing a plurality of correction device pieces fixedly around the steel column in an enclosing manner.
CONSTITUTION: A bottom base 2 is fixed to a column 32 by joining bottom base pieces 21, 22 together so as to hold a ground steel column 32 between them and clamping them with a clamping bolt 4. An uneveness correction device 1 is then composed by placing correction device pieces 11, 12 on the bottom base 2 and joining them together by the bolt 4. Centering of columns 31, 32 are executed by suitably tightening the bolt of each adjuster 13 held by an adjuster holding unit 14 and pressing and sliding the connection steel column 31. After welding the columns 31, 32 together, the uneveness correction device 1 is removed.