Strength around the buffer part is easily improved. The buffer member includes a base portion having a first end edge and a second end edge extending in parallel to each other in a first direction, and a buffer portion bent from the first end edge and disposed above the base portion, A rib that is bent upward from the second end edge, and a locking part that is an outer end in the first direction and is locked to the buffer part by being bent upward, the buffer part has an opening, The rib is held by inserting the locking part into the opening, the rib has a rib body part and a connection part connecting the rib body part and the locking part, The connection part is bent inward in a state where the locking part and the rib body part are bent upward, inserted into the opening together...

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