Packaging material and packaging bag

摘要

A packaging bag ( 1 ) where the heat sealing parts of packaging materials ( 2, 3 ) having a printed light shielding layer ( 14 ) in the layer structure are overlapped and heat sealed, and a sealing state confirming part ( 8 ) having a light transmittance higher than that of the other sealing side is provided across one sealing side ( 11 ) out of both sealing sides facing each other when the heat sealing parts are overlapped. Visual confirmation of incomplete heat sealing part can thereby be facilitated.