The surgical instrument of the present invention includes a first jaw and a second jaw, which are gripping portions, a first joint portion (54a), a first separation portion (55a), a second joint portion (54b) (54a) and the second joint portion (54b) are arranged between the first joint portion (54a) and the second joint portion (54b), and the first joint portion (54a) And a tissue preservation part (56) for preserving a non-bonded region between the first joint part (54a) and the second joint part (54b) when joining the first joint part (54a) and the second joint part (54b).本発明の手術用器具は、把持部となる第一ジョー及び第二ジョーと、第一接合部(54a)と、第一切離部(55a)と、第二接合部(54b)と、第二切離部(55b)と、第一接合部(54a)と第二接合部(54b)との間に配され、第一接合部(54a)と第二接合部(54b)とが生体組織を接合するときに第一接合部(54a)と第二接合部(54b)との間に未接合領域を温存する組織温存部(56)と、を備えた。
