To achieve an air cushioning material capable of suppressing generation of a wrinkle in an end of a welding part for folding when folding an expanded expansion part along the welding part for holding.
A flat air cushioning material 101 with two thin film members bonded includes a plurality of welding parts 143 for cross partitioning formed by welding the two thin film members so that a plurality of expansion parts are formed in a length direction of the thin film members, and a welding parts 150 and 160 for folding for forming the two thin film members by welding in a length direction thereof so that each expansion part can be foldable by being divided into three division expansion parts 111-113 and division communication passages 191 and 192 for communicating the adjoining division expansion parts are regulated. The welding parts for folding includes a pair of projection parts 151 and 161 projecting so as to be opposed to each other from the adjoining cross partitioning welding part 60 as a welding part for passage regulating the division communication passage, and tips 151a and 161a of the projection parts are formed with a round shape.
Takaaki Yasumura
Takeshi Oshio
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