A drug storage container (1) includes: a first container (2)； a second container (6) that is disposed on the lower end side of the first container (2)； a needle tube (71) for making an internal space (30) of the first container (2) and an internal space (60) of the second container (6) communicate with each other； operating means (8) for performing an operation of bringing the first container (2) closer to the second container (6)； a drug (9) stored in the internal space (30)； and a liquid (10) stored in the internal space (60). In the drug storage container (1), with the first container (2) and the second container (6) brought closer to each other by the operating means (8), the internal space (30) of the first container (2) and the internal space (60) of the second container (6) are made to communicate with each other through the needle tube (71), and the volume of the internal space (60) of the second container (6) is reduced, whereby the liquid (10) is caused to flow from the internal space (60) of the second container (6) into the internal space (30) of the first container (2), and the drug (9) and the liquid (10) are mixed with each other, to obtain a drug solution (90).
