It is an object of the resent invention to provide a multi-chamber container that has a weak seal portion having an increased joining strength and being easy to be opened when in administration of medicine, and that is provided at low cost. The multi-chamber container includes a medicine accommodation chamber 1, a diluting solution chamber 3 jointed to one side of the medicine accommodation chamber 1 via a partitioning weak seal portion 2, an unoccupied chamber 5 having a port 6 and joined to an opposite side of the medicine accommodation chamber 1 via a discharging weak seal portion 4, a film member 7 attached to the medicine accommodation chamber 1 for increasing a joining strength of each of the discharging weak seal portion 2 and the discharging weak seal portion 4, the discharging weak seal portion 4 having an easy-to-open portion 8 that enables the discharging weak seal portion 4 to easily opened therethrough.
