Provided is an insertion lock type packaging box that allows an outer flap and an inner flap to be easily and reliably engaged with each other, and that is excellent in handling operability in a stacked state during transportation. In the insertion lock type packaging box, an outer flap 5 is extended from one of the side plates 1, 2 adjacent to each other in the circumferential direction and an inner flap 6 is extended from the other, respectively, and an insertion piece 8 of the outer flap 5 is inserted into an insertion hole 9 of the inner flap 6 while bending the outer flap 5 along the middle folding line 7, An engaging edge 8 b and an inclined edge 8 c are provided, a first rocking piece 10 and a triangular second rocking piece 11 are provided in a portion to be the insertion hole 9, an...

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