An absorbent article comprising: a liquid-permeable topsheet; a liquid-impermeable backsheet; and an absorbent body (30, 130, 230, 330, 430, 530) provided between the topsheet and the backsheet, wherein the absorbent body (30, 130, 230, 330, 430, 530) includes a crotch-corresponding region corresponding to the wearer's crotch when worn, a front region that is adjacent to and forward of the crotch-corresponding region, a rear region being adjacent to and rearward of the crotch-corresponding region, and has a variable-density portion (32, 132, 232, 332, 432, 532) with a density increasing stepwise or gradually from a front toward a rear, the variable-density portion (32, 132, 232, 332, 432, 532) being provided in a region extending at least from the crotch-corresponding region to the rear region, wherein the variable-density portion (32, 132, 232, 332, 432, 532) includes a low-density portion (32L, 132L, 232L, 332L, 432L, 532L), a medium-density portion (32M, 132M, 232M, 332M, 432M, 532M), and a high-density portion (32H, 132H, 232H, 332H, 432H, 532H) from the front toward the rear, wherein the absorbent body (30, 130, 230, 330, 430, 530) includes a groove (40, 41, 42) in a front-rear direction, and wherein a part in which the groove (40, 41, 42) is provided includes the variable-density portion (32, 132, 232, 332, 432, 532). a liquid-permeable topsheet; a liquid-impermeable backsheet; and an absorbent body (30, 130, 230, 330, 430, 530) provided between the topsheet and the backsheet, wherein the absorbent body (30, 130, 230, 330, 430, 530) includes a crotch-corresponding region corresponding to the wearer's crotch when worn, a front region that is adjacent to and forward of the crotch-corresponding region, a rear region being adjacent to and rearward of the crotch-corresponding region, and has a variable-density portion (32, 132, 232, 332, 432, 532) with a density increasing stepwise or gradually from a front toward a rear, the variable-density portion (32, 132, 232, 332, 432, 532) being provided in a region extending at least from the crotch-corresponding region to the rear region, a crotch-corresponding region corresponding to the wearer's crotch when worn, a front region that is adjacent to and forward of the crotch-corresponding region, a rear region being adjacent to and rearward of the crotch-corresponding region, and has a variable-density portion (32, 132, 232, 332, 432, 532) with a density increasing stepwise or gradually from a front toward a rear, the variable-density portion (32, 132, 232, 332, 432, 532) being provided in a region extending at least from the crotch-corresponding region to the rear region, wherein the variable-density portion (32, 132, 232, 332, 432, 532) includes a low-density portion (32L, 132L, 232L, 332L, 432L, 532L), a medium-density portion (32M, 132M, 232M, 332M, 432M, 532M), and a high-density portion (32H, 132H, 232H, 332H, 432H, 532H) from the front toward the rear, wherein the absorbent body (30, 130, 230, 330, 430, 530) includes a groove (40, 41, 42) in a front-rear direction, and wherein a part in which the groove (40, 41, 42) is provided includes the variable-density portion (32, 132, 232, 332, 432, 532).