PROBLEM TO BE SOLVED: To provide a mixing container in which a liquid agent accommodated in one container can be smoothly transferred to another container without scattering to the surroundings, and an operation of transferring the liquid agent is simple. In the mixing container of the present invention, a valve (4) provided in a first container (1) is in contact with an inner plug (8) while holding the first container (1) by a second peripheral wall (8b) so that the first bottom wall (4a) is closed. It has a first protrusion 4g that is elastically deformed so as to be separated from the second bottom wall 8a and opens the slit 4e for air and the slit 4f for liquid agent, and / or the inner plug 8 provided in the second container 6 is While holding the first container 1 with the two peripheral walls 8b, the first bottom wall 4a is elastically deformed so as to be separated from the second bottom wall 8a by contacting the valve 4, and the air slit 4e and the liquid agent slit 4f are formed. It is characterized by having a second protrusion 8d to be opened. [Selection diagram] FIG.【課題】一方の容器に収容された液剤を他方の容器に対してスムーズに且つ周囲への飛び散り無く移し替えることができるうえ、液剤を移し替える操作も簡単になる混合容器を提案する。【解決手段】本発明の混合容器において、第一容器１に設けたバルブ４は、第二周壁８ｂで第一容器１を保持した状態において中栓８に当接して第一底壁４ａを第二底壁８ａから離間させるように弾性変形させて、空気用スリット４ｅ及び液剤用スリット４ｆを開口させる第一突起４ｇを有する、及び／又は、第二容器６に設けた中栓８は、第二周壁８ｂで第一容器１を保持した状態においてバルブ４に当接して第一底壁４ａを第二底壁８ａから離間させるように弾性変形させて、空気用スリット４ｅ及び液剤用スリット４ｆを開口させる第二突起８ｄを有する、ことを特徴とする。【選択図】図３
