To make a necessary unit amount of lyophilized material transferable in a mass by making a cylindrical shell member uniformly tubular with the internal shape thereof in a traverse section almost identical to let a bottom member or an opening plug body slide liquid tight therethrough.

A container 2 for lyophilization of a medical container in which a lyophilized matter 4 is housed in one chamber, while a dissolving agent thereof is housed in the other chamber to make both the chambers communicate with each other in the using of the container is made up of a cylindrical shell member 6, a bottom member 8 and an opening plug body 9. The cylindrical shell member 6 is made uniformly tubular with the internal shape in a traverse section almost identical to let the bottom member 8 slide liquidtight therethrough. The central part of the bottom member 8 is made of a heat conductive material 8A and the periphery thereof is made of an elastic material 8B. The shell member 6 is made of glass. With a such an arrangement, a pushing element is inserted into an opening part 22 to move the bottom member 8 liquidtight through the shell member 6 and the lyophilized material 4 is extruded from the shell member 6. This makes the freeze drying material transferable into the medical container in a mass.