To provide a packing box capable of effectively preventing bulging of a side wall with little influence on caser appropriateness.SOLUTION: A wraparound packing box 1 has a step misaligned part formed in a longitudinal rule mark L30 extending in a longitudinal direction in a used state. In the step misaligned part, a vertical middle part L31 of the longitudinal rule mark L30 formed at the edge of a side wall 12 is offset outside with respect to vertical both ends L32 of the longitudinal rule mark L30, and notches 33, 33 are formed from both ends of the offset middle part L31 of the longitudinal rule mark L30 toward the side wall 12.SELECTED DRAWING: Figure 1

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