A cushion includes at least one first medium container bag and at least one second medium container bag arranged in a second direction to surround an object and each extending in a first direction and capable of containing a medium that absorbs shock to the object. The at least one first medium container bag includes: a first container having a first area in cross section; and a second container protruding, from an end portion of the first container in the first direction, toward a distal end portion of the at least one first medium container bag in the first direction. The second container has a second area in cross section which is less than the first area. The second container protrudes to a position nearer to the distal end portion than each of the at least one second medium container bag in the first direction.