A dehiscence preventive member is adapted to cover up a wound and surrounding tissues. A plurality of holding members are adapted to hold the dehiscence preventive member closely upon the wound and the surrounding tissues, and a contraction preventive member keeping the dehiscence preventive member suitably expanded in a dehiscence direction and of preventing the expanded dehiscence preventive member from contracting. The contraction distance of the dehiscence preventive member in the dehiscence direction is equal to or greater than a contraction distance of the holding member in the dehiscence direction. The dehiscence preventive is closely applied to the wound and surrounding tissues after expansion in the dehiscence direction such that the contraction distance of the dehiscence preventive member in the dehiscence direction is equal to or greater than the contraction distance of the dehiscence preventive member in a direction normal to the dehiscence direction.
