PURPOSE: An apparatus for correcting the straightness of a metal pipe is provided to improve work efficiency within a short time with a few works and to prevent safety accidents with installing a guide member in a through-hole which the pipe enters. CONSTITUTION: An apparatus for correcting the straightness of a metal pipe includes a main body frame (110), a guide member (120), a pipe correcting unit, and an adjusting part (140). The bent pipe is capable of being inserted into the frame. The guide member is formed with urethane, and guides the smooth entrance of the pipe to a through hole at the center of the frame. The pipe correcting unit has multiple rollers and a driving unit. The rollers are sequentially arranged on the frame in zigzags, and interconnect the rollers. The adjusting part adjusts distances among the rollers, and adjusts alternating angles among the rollers in a lump or separately.
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