To suppress deformation of a container at heating by forming a vapor outlet in an appropriate position and size, with respect to the container capable of heating a content without opening.SOLUTION: A container which comprises a first container body, and a second container body joined to the first container body in a joint area positioned in a peripheral edge part of an inner space formed by the first container body is such that: the joint area is constituted so that a vapor outlet for communicating the inner space to an outer space when inner pressure of the inner space rises is formed in one or a plurality of sections in a circumferential direction; and a total width of the vapor outlet in an outer peripheral edge part of the joint area is 4 percent or more and 35 percent or less of the entire outer peripheral length of the joint...

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