The medical device includes a connector portion, the connector portion includes an inner cylinder that can be connected to another medical device having an elastic valve, and the elastic valve is connected from the distal end side by the connection between the inner cylinder and the other medical device. A valve body to be pressed, and an outer cylinder disposed radially outside the inner cylinder, and the inner cylinder is axially connected to the outer cylinder in a state where the inner cylinder is connected to the other medical device. By moving the connector portion, the presence or absence of fluid communication between the connector portion and the other medical device is configured to be switched, and the connector portion is configured such that the valve body has a proximal end relative to the inner cylinder. It further has an anchor for suppressing the movement to the side.医療器具は、コネクタ部を備え、該コネクタ部は、弾性弁を有する他の医療器具と接続可能な内筒と、前記内筒と前記他の医療器具との接続によって前記弾性弁が先端側から押し付けられる弁体と、前記内筒の径方向外側に配置された外筒とを有すると共に、前記内筒を前記他の医療器具と接続した状態で前記内筒を前記外筒に対して軸方向に移動させることにより、前記コネクタ部と前記他の医療器具との流体連通の有無を切り換えるように構成されており、前記コネクタ部は、前記弁体が前記内筒に対して相対的に基端側に移動することを抑制するアンカーをさらに有する。
