Using an easy operation that can be carried out with a simple structure, this drug transfer kit connects a syringe barrel with a drug container through a closed system, adjusts the gas pressure within the drug container through the closed system using a volume-variable third member connected to a first member, and transfers a drug between the syringe barrel and the drug container through the closed system via a first hollow needle member and a second hollow needle member in the closed system. Moreover, the drug transfer kit connects the syringe barrel, to which the drug was transferred, with an infusion solution container or an infusion solution set through the closed system, and transfers the drug between the syringe barrel and the infusion solution container or the infusion solution through the closed system via the first hollow needle member and a fourth hollow needle member or a hollow member in the closed system. The first to fourth members are easily and reliably connected by a fitting mechanism, said hollow needle members penetrate the elastic members of each member while said elastic members connect to and abut one another, and the hollow needle members are inserted into the hollow needle members or the hollow member.Linvention concerne une trousse dadministration de médicament, qui relie un tube de seringue à un récipient de médicament à laide dun système de fermeture au moyen dune opération facile qui peut être réalisée à laide dune configuration simple, règle la pression de gaz dans le récipient de médicament au niveau du système de fermeture au moyen dun troisième élément à volume variable relié à un premier élément, et administre un médicament entre le tube de seringue et le récipient de médicament par lintermédiaire dun premier élément daiguille creuse et dun deuxième élément daiguille creuse dans le système de fermeture. De plus, la trousse dadministration de médicament relie le tube de seringue, dans lequel a été administré le médicament, à un récipi
