A disposable body fluid absorbent article includes, a liquid-absorbent core 4, the core 4 is provided in the vicinity of opposite side edges 11 extending in parallel to each other in a longitudinal direction thereof with depressed regions 18 tapering from an upper surface 16 toward a lower surface 17 of the core 4 and extending along a pair of imaginary lines A-A extending in the longitudinal direction so as to describe convex curves respectively facing a center line C-C bisecting a width of the core 4.