A packaging bag and a drying agent with a moisture absorption indicator function are provided without using a heavy metal harmful to the human body. The packaging bag includes a first packaging material (10) and a second packaging material (20). The first packaging material (10) is provided on an outermost side thereof with a transparent barrier film (12) having a barrier property against water vapor. The second packaging material (20) has a light-reflective or light-absorbing film (24) and a pattern printed layer (23) overlaid on a bag interior side thereof, the pattern printed layer (23) having a printed moisture-absorbing indicator pattern (30). A desiccant-containing resin film (11, 21) which becomes transparent due to moisture absorption is overlaid on a bag interior side of at least one of the first packaging material (10) and the second packaging material (20). The drying agent with a moisture absorption indicator function includes an indicator film layer (70) having a barrier film (75), a pattern printed layer (73) for a moisture absorption indicator, and a moisture-absorbing film (71) containing zeolite, the pattern printed layer (73) and moisture-absorbing film (71) being laminated in this order on the barrier film (75). The drying agent further includes a main desiccant layer (61) and a moisture permeable film (64) that are overlaid on the moisture-absorbing film (71).