AN ABSORBENT BODY SECTIONED INTO THREE PORTIONS IN THE LONGITUDINAL DIRECTION, WHICH COMPRISES A FIRST ABSORBENT PORTION AS A MIDDLE PORTION, A SECOND ABSORBENT PORTION THAT IS SECTIONED INTO ONE SIDE OF THE FIRST ABSORBENT PORTION, AND A THIRD ABSORBENT PORTION THAT IS SECTIONED INTO THE OTHER SIDE OF THE FIRST ABSORBENT PORTION, WHEREIN EACH OF THE ABSORBENT PORTIONS COMPRISES: A FLUID RECEIVING LAYER PORTION FOR ABSORBING A FLUID AND DIFFUSING THE FLUID IN THE PLANAR DIRECTION PLURAL PROJECTING FLUID-ABSORBENT-STORAGE PORTIONS FOR ABSORBING AND STORING THE FLUID, WHICH ARE CONTINUOUS WITH THE FLUID RECEIVING PORTION AND INDEPENDENTLY DISPOSED ON ONE SURFACE SIDE OF THE FLUID RECEIVING LAYER PORTION AND CONCAVE PORTIONS THAT ARE CONCAVE IN THE FORM OF GROOVES ON ONE SURFACE OR ON FACING POSITIONS OF BOTH SURFACES, WHEREIN THE CONCAVE PORTIONS ARE DISPOSED BETWEEN THE PROJECTING FLUID-ABSORBENT-STORAGE PORTIONS, FIRST CONCAVE PORTIONS DISPOSED ON THE FIRST ABSORBENT PORTION ARE ARRANGED INSIDE THE OUTER EDGES OF THE FIRST ABSORBENT PORTION IN PLANAR VIEW AND ARRANGED IN THE LONGITUDINAL DIRECTION, SECOND AND THIRD CONCAVE PORTIONS DISPOSED ON THE RESPECTIVE SECOND AND THIRD ABSORBENT PORTIONS ARE RESPECTIVELY ARRANGED IN INCLINED DIRECTIONS TO THE LONGITUDINAL DIRECTION, THE FIRST AND SECOND CONCAVE PORTIONS, AND THE FIRST AND THIRD CONCAVE PORTIONS ARE CONSTITUTED AS CONTINUOUS CONCAVE PORTIONS, OR THE FIRST CONCAVE PORTIONS ARE SPACED APART FROM THE SECOND CONCAVE PORTIONS AND THE THIRD CONCAVE PORTIONS, WHEREIN THE PROJECTING FLUID-ABSORBENT-STORAGE PORTIONS HAVE A HIGHER AREA RATIO THAN THAT OF THE CONCAVE PORTIONS, AND THE FLUID RECEIVING LAYER PORTION ON THE BOTTOM PORTIONS OF THE CONCAVE PORTIONS HAS LOWER BASIS-WEIGHT AND DENSITY THAN THOSE OF THE PROJECTING FLUID-ABSORBENT-STORAGE PORTIONS.
