The medical container 1 includes: a container body 2 having a tubular shape and including an inner peripheral portion 2a inside, a mouth section 21 provided at a distal end portion, through which liquid can enter and exit, a proximal-end opening 261 at a proximal end section, and a proximal-end edge portion 25 surrounding the proximal-end opening 261 a plug body 3 that seals the mouth section 21 a bag body 4 having a bag-like shape and including an edge portion 41 that is tightly fixed to the proximal-end edge portion 25 and seals the proximal-end opening 261, and a reversing part 42 which is surrounded by the edge portion 41, has flexibility, and is reversed inside/outside and a space 12 surrounded by the container body 2, the plug body 3 and the bag body 4. The reversing part 42 is reversed inside/outside when the liquid enters and exits the space 12 through the mouth section 21, whereby the reversing part 42 can take a first state in which the reversing part expands toward a distal end side, and a second state in which the reversing part 42 expands toward the proximal end side. In both the first state and the second state, the reversing part 42 is separated from the inner peripheral portion 2a of the container body 2.
