A packaging container for allowing an outer case and an inner case to be positively locked with each other at sealing. The packaging container comprises a rectangular cylindrical outer case (A) formed at the upper edge of a front end opening with a suspending locking protrusion (13), and an inner case (B) which has a locking protrusion (25) erected on the upper surface, forms a box-shaped gripping portion (B2) having a locking hole (48) opened adjacent to the locking protrusion (25), and has flaps (38, 39) provided continuously from side plates (32, 33) provided continuously on the left and right opposite sides of a bottom plate (15), for supporting the gripping portion (B2) so as not to be smashed.