To provide a container for mixing capable of providing a sufficient sealing property between a liquid storing room and a powder storing room, surely separating powder until opening even if inner pressure becomes high by an influence of an external environment, and mixing liquid and the powder by a simple operation when it is used.

The container for mixing is constituted so that, to a power storing cylinder 20 fitted to a container body A the inside of which is the liquid storing room R1, a stopper member C in which a sealing face 21 at the lower end is closed by a cylindrical sealing part 30 at the lower end to form the powder storing room R2 is mounted at the surroundings so as to be descended by screwing, a nozzle member D for descending by screwing the stopper member by rotation is provided, the stopper member is separated by screwing and descending the stopper member by rotating the nozzle member, to thereby make the inside of the powder storing room communicate with the inside of the liquid storing room.