A forceps cover sheath (45) comprises, detachably from a forceps (1), a cover sheath main body (46) covering at least a link mechanism (9) out of the forceps (1) which has the link mechanism (9) at a distal end portion of an elongated shaft (12) and which has, at a distal end portion of the link mechanism, a treatment portion (10) operated by operation of the link mechanism.
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