The invention includes an absorbent article 1 in which an undergarment 90 can be prevented from getting dirty with fluid that has been absorbed by an absorbent body 20, without a decrease in the amount of fluid that can be absorbed.The absorbent article 1 that is worn on a human body and used includes an absorbent body 20 having a fluid-absorbent member 22 for absorbing fluid, and having a longitudinal direction, a width direction, and a thickness direction, and a main body section 10 whose face on the side of the human body is overlapped with the absorbent body 20 in the thickness direction, one end section 20a in the longitudinal direction of the absorbent body 20 being fixed to the main body section 10, the absorbent body 20 having a portion that is closer to the main body section 10 than the fluid-absorbent member 22 in the thickness direction and a portion that is closer to the human body than the fluid-absorbent member 22, wherein the portion closer to the main body section 10, in another end section 20b in the longitudinal direction of the absorbent body 20, is covered with a fluid-impermeable layer 50, and the portion closer to the human body, in the other end section 20b, has a portion in which the fluid-impermeable layer 50 is not included.