Absorbent article

An absorbent article, comprising:

• a top sheet that is liquid-permeable;
• a back sheet that is liquid-impermeable;
• and
• an absorbent body situated between the top sheet and the back sheet in a thickness direction of the absorbent article,
• wherein at least one of the top sheet and the back sheet comprises a synthetic resin sheet that includes a synthetic resin component and an oxidative decomposer,
• wherein the oxidative decomposer comprises a mixture of a carboxylate and a rare earth compound,
• wherein the synthetic resin sheet includes the oxidative decomposer in a mass ratio such that a decomposition rate index (Di) is 7.8 or less, as determined by the following formula (1):
• Di=Br×Sa (1)
• where Br represents a mass ratio (g/g) of the oxidative decomposer with respect to the synthetic resin component, and Sa represents a specific surface area (cm2/g) of the synthetic resin sheet,
• wherein the absorbent article includes an oxidative decomposition accelerator in a mass ratio of 40 parts by mass or greater with respect to 100 parts by mass of the oxidative decomposer,
• wherein the oxidative decomposition accelerator is a peroxide, and
• wherein the oxidative decomposition accelerator is one or more of:
• situated further toward a back sheet side in the thickness direction than the absorbent body, and
• contained within water-sensitive capsules that are situated within the absorbent body.