Provided is a packaging box that can be easily unsealed and used as a tray. The packaging box 1 includes a rear wall 40 connected to the bottom plate 10, a top plate 60 connected to the rear wall 40, a front wall 20 connected to the top plate 60, a lower front plate 30 connected to the bottom plate 10, 50 on the left and right side walls 50, 50. The rear wall 40 and the top plate 60 are connected to each other via a first folding line L1, and a first cutting guide line L10 is formed from one end to the other end of the first folding line L1. Figure 2

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