PROBLEM TO BE SOLVED: To provide an exhaust member and a medical instrument used for a medical instrument that can be quickly adjusted so that an appropriate pressure is obtained in a negative pressure portion. An exhaust member (4) is used for a medical device including a negative pressure portion. The exhaust member 4 includes a first opening portion 4b connectable to the negative pressure portion, a second opening portion 4c capable of exhausting air from the inside to the outside when contracted, and the elastically recoverable first opening portion 4b. 4b and a squeezing section 4a capable of repeatedly exhausting air through the second opening 4c. A ridge 4d is formed on the inner surface or the outer surface of the compressed portion 4a. [Selection diagram] Figure 2【課題】陰圧部内が適当な圧力となるように迅速に調整可能な医療用器具に用いられる排気部材及び医療用器具を提供する。【解決手段】排気部材４は、陰圧部を備える医療用器具に用いられる。排気部材４は、陰圧部に接続可能な第１開口部４ｂと、収縮したときに内部から外部にエアを排気可能な第２開口部４ｃと、弾性復元可能に構成されて第１開口部４ｂ及び第２開口部４ｃによりエアを繰り返し排気可能とする圧搾部４ａと、を備える。圧搾部４ａの内面又は外面に突条４ｄが形成されている。【選択図】図２
