PROBLEM TO BE SOLVED: To provide a medical needle safety device with which accidental exposure of sharp tips contaminated with blood, etc. from the lower part of the device does not occur.SOLUTION: Provided is a medical needle safety device (1) equipped with a shield member (3). The shield member comprises a shield hub (35), a shield member connection hub (40H), and legs (31, 32). The legs (31, 32) can be extended from a first folded position to a second extended position. The device is formed so that when the legs (31, 32) are in the first folded position, the needle (21) is inserted into a space (40S) in the shield member connection hub (40H), and when the legs (31, 32) are extended to the second extended position, a wall (43DW) of a sliding member (42) is drawn into the space (40S) of the shield member connection hub (40H) and can keep the tip (23) of the needle (21) from being exposed to the outside.COPYRIGHT: (C)2013,JPO&INPIT【課題】 血液等で汚染された尖った先端が、装置下部から偶発的に飛び出すことがない医療用針安全装置を提供する。【解決手段】シールド部材(3)を備え、当該シールド部材は、シールドハブ(35)と、シールド部材接続ハブ(40H)と、脚部(31・32)とを有し、この脚部(31・32)は、第1の折り畳み位置から第2の伸張位置まで伸張でき、前記脚部(31・32)が第一の折り畳み位置にあるときは、針(21)は、前記シールド部材接続ハブ(40H)の空間(40S)内に挿入され、前記脚部(31・32)が第二の伸長位置までに伸長されたときは、前記摺動部材(42)の壁(43DW)は、前記シールド部材接続ハブ(40H)の空間(40S)内に引きこまれ、針(21)の末端(23)が外部に露出するのを防ぐことができるように形成した、医療用針安全装置(1)を提供する。【選択図】 図1