To provide a container sealing method in which a sealed portion is hard to peel off or break, a container sealing method in which a sealing speed is high and the cost of a device can be reduced, and a container sealing method without using a stapler or a sealing tape. Each first protrusion 27 protruding from the first flange 26 of the first container 20 and each second protrusion 37 protruding from the second flange 36 of the second container 30 are fitted to each other. The container 1 is carried in a direction shown by an arrow F2 by a belt conveyor 53, and each first protrusion 27 and each second protrusion 37 are crushed and plastic-deformed by a rotating pressure roller 51 and a receiving member 52, and the plastic-deformed parts are brought into a state where they are fitted to each other. Figure 4

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