To provide a food packaging material capable of obtaining suitable cleavable property when a pair of opening strips that are corrugated and cross each other are used as cleavage means of an outer sheet.SOLUTION: A food packaging material 1 used for packaging food 6 in a triangular or substantially triangular shape, includes a first width wide part 50 and a second width wide part 51 which are formed by crossing of corrugations of a pair of opening strips 5 and 5 from one end 10a side to the other end 10b side. i) A maximum width W5b of the second width wide part 51 is larger than a maximum width W5a of the first width wide part 50. ii) A distance L5ac from the one end 10a to a final end of the first width wide part 50 is set to 16% or more and 40% or less of a total length L1 from the one end 10a to the other end 10b. iii) A distance L5cd from the final end of the first width wide part 50 to a final end of the second width wide part 51 is 54% or more and 82% or less of the total length L1. A distance L5ad from the one end 10a to the final end of the second width wide part 51 is set to 82% or more of the total length.SELECTED DRAWING: Figure 4【課題】外シートの開裂手段として、波形でかつ互いに交差する一対の開封用条体を用いる場合に、好適な開裂性を得ることができる食品用包装材を提供する。【解決手段】食品６を三角形状ないし略三角形状に包装する食品用包装材１であって、一端１０ａから他端１０ｂ側に、一対の開封用条体５，５の波形の交差によって形成される第一幅広部５０及び第二幅広部５１を備え、ｉ）第二幅広部５１の最大幅Ｗ５ｂは、第一幅広部５０の最大幅Ｗ５ａよりも大きく、ｉｉ）一端１０ａから第一幅広部５０の終端までの距離Ｌ５ａｃは、一端１０ａから他端１０ｂまでの全長Ｌ１の１６％以上４０％以下に設定され、ｉｉｉ）第一幅広部５０の終端から第二幅広部５１の終端までの距離Ｌ５ｃｄは、全長Ｌ１の５４％以上８２％以下に、かつ、一端１０ａから第二幅広部５１の終端までの距離Ｌ５ａｄは、全長の８２％以上に設定される。【選択図】図４
