An embroidery unit of the present disclosure is detachably attached to a sewing machine bed including a feed dog mechanism having a feed dog. The embroidery unit includes an X-transfer mechanism and a Y-transfer mechanism moving an embroidery frame to an X-direction parallel to a lengthwise direction of the sewing machine bed and a Y-direction perpendicular to the X-direction respectively. The embroidery unit further includes an embroidery unit main body attached to the sewing machine bed either in an embroidery attachment position for performing embroidery sewing with an embroidery frame or in a normal sewing attachment position for performing a sewing operation by the feed dog of the cloth feed mechanism.