An absorbent article comprising an absorber including: a front surface side sheet; a back surface side sheet disposed on the back surface side of the front surface side sheet; a plurality of cells each of which is surrounded by bonded portions of the front surface side sheet and the back surface side sheet, and inside each of which the front surface side sheet and the back surface side sheet are not bonded; and particulate materials which include superabsorbent polymer particles and which are contained in the cells, wherein the bonded portions are provided in continuous line shapes or dotted line shapes so as to form a honeycomb shape having the same-sized regular hexagons as unit shapes, all the cells are the same-sized regular hexagonal cells each of which is surrounded by the bonded portions, the bonded portions positioned on at least one side of each cell are weak bonded portions which can be peeled off due to a swelling force of the superabsorbent polymer particles in the cells adjacent to the bonded portions, longitudinal-strong-bond lines on which strong bonded portions are continuously provided in the front-back direction along the maximum length of the absorber, are provided in the center portion and the both side portions in the width direction of the absorber, respectively, a plurality of lateral-strong-bond lines on which strong bonded portions are provided continuously in the oblique direction from the longitudinal-strong-bond line in the center portion to each of the longitudinal-strong-bond lines in the both side portions is provided at intervals in the front-back direction, the lateral-strong-bond lines are formed in a zigzag shape extending in the front-back direction while repeatedly bending left and right between the longitudinal-strong-bond line in the center portion and each of the longitudinal-strong-bond lines in the both side portions, sections, which are surrounded by the longitudinal-strong-bond lines and the lateral-strong-bond lines so as to be partitioned, are maximum enlargement sections in which the bonded portions positioned between cells in the sections are only the weak bonded portions, and each maximum enlargement section has a substantially triangular shape. a front surface side sheet; a back surface side sheet disposed on the back surface side of the front surface side sheet; a plurality of cells each of which is surrounded by bonded portions of the front surface side sheet and the back surface side sheet, and inside each of which the front surface side sheet and the back surface side sheet are not bonded; and particulate materials which include superabsorbent polymer particles and which are contained in the cells, wherein the bonded portions are provided in continuous line shapes or dotted line shapes so as to form a honeycomb shape having the same-sized regular hexagons as unit shapes, all the cells are the same-sized regular hexagonal cells each of which is surrounded by the bonded portions, the bonded portions positioned on at least one side of each cell are weak bonded portions which can be peeled off due to a swelling force of the superabsorbent polymer particles in the cells adjacent to the bonded portions, longitudinal-strong-bond lines on which strong bonded portions are continuously provided in the front-back direction along the maximum length of the absorber, are provided in the center portion and the both side portions in the width direction of the absorber, respectively, a plurality of lateral-strong-bond lines on which strong bonded portions are provided continuously in the oblique direction from the longitudinal-strong-bond line in the center portion to each of the longitudinal-strong-bond lines in the both side portions is provided at intervals in the front-back direction, the lateral-strong-bond lines are formed in a zigzag shape extending in the front-back direction while repeatedly bending left and right between the longitudinal-strong-bond line in the center portion and each of the longitudinal-strong-bond lines in the both side portions, sections, which are surrounded by the longitudinal-strong-bond lines and the lateral-strong-bond lines so as to be partitioned, are maximum enlargement sections in which the bonded portions positioned between cells in the sections are only the weak bonded portions, and each maximum enlargement section has a substantially triangular shape.