The medical device with a needle of the present invention comprises a needle tube (6) having a needle tip that can be punctured into a living body, an elastic member, a needle tip (6a) that can puncture a living body at one end, and a needle tip at the other end. A seal member (5) is provided that holds the outer surface of the needle tube (6) in a liquid-tight state with the base end (6b) opposite to (6a) protruding. Moreover, it has the liquid storage part (3) which has the liquid chamber (10) which can store a liquid inside, and the needle installation part (2) formed in the end of the liquid storage part (3). The seal member (5) is placed in contact with the inner surface of the needle placement portion (2) and compressed in the needle placement portion (2), and the proximal end portion (6b) of the needle tube (6) is liquid. It communicates with the chamber (10).本発明の針付医療器具は、生体に穿刺可能な針先を有する針管（６）と、弾性部材からなり、一端に生体に穿刺可能な針先（６ａ）を突出させ、他端に針先（６ａ）とは反対側の基端部（６ｂ）を突出させた状態で針管（６）の外表面を液密に保持するシール部材（５）を備える。また、内部に液体を収容可能な液室（１０）を有する液収容部（３）と、液収容部（３）の一端に形成された針設置部（２）とを有する。そして、シール部材（５）は針設置部（２）の内表面に当接すると共に針設置部（２）内に圧縮された状態で設置され、針管（６）の基端部（６ｂ）は液室（１０）に連通されている。
