PROBLEM TO BE SOLVED: To provide a substantially tamper-resistant connection device that eliminates an accident of erroneously removing a connected medical device, and an assembly method.SOLUTION: A connection device includes: a first connection member 21 for being connected to a first medical device by the rotation operation in a first direction and a body 60. Furthermore, the first connection member and the body are directly or indirectly connected to each other via at least one designated breakable holding member 41. The designated breakable holding member 41 is configured so as to be broken by predetermined destructive force, and then after the breakage of the designated breakable holding member 41, the first connection member 21 and the assembled first medical device are displaceable with respect to the body 60.COPYRIGHT: (C)2014,JPO&INPIT【課題】接続された医療装置を誤って外してしまうような事故を排除する実質的にタンパーレジスタントな接続装置及び組み立て方法を提供する。【解決手段】接続装置は、第1の方向への回転動作によって第1の医療装置に接続するための第1の接続部材21と、本体60とを備える。更に、第1の接続部材及び本体は、少なくとも1つの指定破損可能保持部材41を介して直接又は間接的に接続され、指定破損可能保持部材41は所定の破壊力で破損するように構成され、破損後、第1の接続部材21及び組み付け後の第1の医療装置は、本体60に関して変位可能である。【選択図】図5b