To easily put on a corset for posture correction on the body and to surely fix a back pad part to a back part regarding the posture correcting a corset for correcting the bad posture of an upper half body.

The corset is provided with a vertically long back pad part, a belt inserting and guiding part provided on the lower part of the back pad part, a pair of shoulder belts for which one end of each is attached to the left and right corner parts of an upper edge at the upper part of the back pad part, loop parts for forming space for passing through left and right arms are provided and the other free end parts are mutually crossed, inserted to the belt inserting and guiding part and extended to an abdominal part side, disengageable shoulder belt engaging means attached to the free end parts of the shoulder belts, a pair of waist bands for which one end of each is connected to both side edge parts at the lower part of the back pad part and the other free end parts are extended to the abdominal part side and disengageable waist band engaging means attached to the free end parts of the waist bands.