Providing extemporaneously mixing vessel can be separate from the cover removal operation such as a cap, to perform the mixing operation of the two drugs in the container. A cylindrical portion 11, the inner cylinder 13 a closed top cylindrical partitioned into two chambers above and below the cylindrical portion is erected continuously provided in the cylindrical inner surface, and a first opening 13b, which is formed in the top surface 13a of the inner cylinder , fitted with tubular portion 31 and the movable body 1 made first drug A is contained in the lower chamber, assembled rotatably to the movable body is tightly fitted into the upper chamber of the movable body, fitted cylinder inner surface an adapter 3 having a second opening portion 35a that is formed in the partition wall surface and the partition surface 35 to be close contact with the top surface of the inner tube of the movable body provided so as not to overlap with the first opening, the upper chamber of the adapter and a lower inlet tube portion 42 to be assembled non-rotatably relative to the adapter by tightly fitted into, and a container body 4 to be second agent B is accommodated, and by relatively rotating the movable member relative to the container body and a time in the, and a second opening and the first opening is overlapped.キャップ等の脱蓋操作とは独立して、容器内で二種の薬剤の混合操作を行うことができる用時混合容器を提供する。筒部11と、筒部内面に起立連設され筒部を上下二室に仕切る有頂筒状の内筒13と、内筒の天面13aに穿設された第一開口部13bを有し、下室に第一薬剤Aが収容されてなる可動体1と、可動体の上室に密嵌入して可動体に対し回転可能に組付けられる嵌着筒部31と、嵌着筒部内面に設けられ可動体の内筒の天面に密着する隔壁面35と、第一開口部と重ならないように隔壁面に穿設された第二開口部35aを有するアダプタ3と、アダプタの上室に密嵌入してアダプタに対し回転不能に組付けられる下口筒部42を有し、第二薬剤Bが収容されてなる容器本体4とを備え、容器本体に対して可動体を相対回転させたときに、第一開口部と第二開口部とが重なるように構成されている。
