A packaging material capable of having a desired sealing strength with ease and a packaging bag using such material are provided. A packaging material (1), which serves as either one of a first and a second packaging materials (1, 1A) to be heat-sealed to each other, includes a sealing portion (2). This sealing portion is weaker in sealing strength than other portions and composed of an applied area (3) of a coating agent preventing the heat sealing and a non-applied area (4) of the coating agent. The applied area and the non-applied area are easily changed in an area size from each other depending on the sealing strength required for the sealing portion.