A medical treatment implement which has an excellent degree of freedom of a procedure and into which a trocar can be re-stuck includes a tubular retractor main body configured to be indwelled in an incision wound and a converter (20) configured to close an opening end portion of an upper end of the retractor main body and to be puncturable with a trocar. The converter (20) includes a ring-shaped frame portion (22) detachably mounted on the opening end portion and a sheet portion (21) which is mounted inside the frame portion (22) and airtightly covers the opening end portion. A compression force P is applied to the sheet portion (21) in an inner diameter direction.
