Packaging bag

A packaging bag formed into a bag shape using a packaging material made of a sheet material,

• the sheet material comprising a first sheet material and a second sheet material overlapped with the first sheet material,
• the first sheet material is folded at both side ends in a width direction thereof,
• the packaging bag comprising:
• a pair of overlapping portions formed in the second sheet material, in which one of side edges or a portion in proximity thereto of the second sheet is overlapped with one of side edges of the first sheet material, and an other side edge or a portion in proximity thereto of the second sheet material is overlapped with an other side edge of the first sheet material, in a longitudinal direction;
• a pair of first sealed areas, in which the pair of overlapping portions are respectively sealed to the pair of side edges of the first sheet along the longitudinal direction from one end to an other end of the first sheet material and the second sheet material;
• one or a pair of second sealed areas, in which the first sheet material and the second sheet material are sealed across the entire width on at least one end side in the longitudinal direction of the first sheet material and the second sheet material;
• and
• a tab part formed in the second sheet material,
• the tab part having three sides fixed by the pair of first sealed areas and one of the pair of second sealed areas, or by the one of the pair of first sealed areas and the pair of second sealed areas.