a chemicals mixing container includes : a cylinder having a tubular shaped outer tube , and an end wall which seals one end of the outer tube ; an elastic partition wall placed inside the outer tube to define a mixing chamber within the cylinder ; and an ejection auxiliary member placed inside the outer tube and outside the mixing chamber , and which has an end face swollen toward the mixing chamber and moreover which is enabled to press the elastic partition wall against the end wall . the chemicals mixing container is enabled to reliably mix a liquid material and a powder material together and discharge a mixture of the liquid material and the powder material without waste .