Abstract: A chemicals mixing container 1 includes: a cylinder 8 having a tubular shaped outer tube 10, and an end wall 11 which seals one end of the outer tube 10 and in which an ejection hole 15 has preliminarily been formed or is formable and which has an inner wall surface swollen outward; an elastic partition wall 12 which is placed inside the outer tube 10 so as to be able to define a mixing chamber 5 within the cylinder 8, and which has such elasticity as to be swollen toward one side counter to the inner wall surface of the end wall 11; and an ejection auxiliary member 13 which is placed inside the outer tube 10 and outside the mixing chamber 5, and which has an end face swollen toward the mixing chamber 5 and moreover which is enabled to press the elastic partition wall 12 against the end wall 11. The chemicals mixing container 1 is enabled to reliably mix a liquid material 2 and a powder material 4 together and discharge a mixture 18 of the liquid material 2 and the powder material 4 without waste.