The variable-shape side bracket according to the present invention includes: a bracket stator that is in contact with two opposing linear structures from a lower side and extends long in a direction away from the individual linear structures from an upper side; a bracket mover that contacts the upper side of the bracket stator and slides along the upper side of the bracket stator to penetrate the square bar together with the bracket stator or protrude from the bracket stator to penetrate the square bar on the bracket stator; and a bracket position adjuster for limiting sliding of the bracket mover on the bracket stator while in contact with the bracket stator and the bracket mover.
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