Physiological sanitary napkin, sanitary napkin container, and underpants-type absorbent article

Provided are a sanitary napkin, a container for the sanitary napkin, and an underpants-type absorbent article, the sanitary napkin having improved functional material effects in a short time after being worn while ensuring the overall softness of the article. A sanitary napkin (1) having a liquid-absorbing absorbent core (2), a skin-side sheet (3) disposed on the skin side relative to the absorbent core (2) in the thickness direction, and a non-skin-side sheet (4) disposed on the non-skin side relative to the absorbent core (2) in the thickness direction, the sanitary napkin (1) being provided with a low-emissivity sheet (10) between the skin-side sheet (3) and the non-skin-side sheet (4), the low-emissivity sheet (10) having a lower emissivity than the non-skin-side sheet (4). A functional material (50) is provided on the skin side of the low-emissivity sheet (10) in the thickness direction, the outer end (10e) of the low-emissivity sheet (10) is positioned on the inner side of the outer end (1e) of the sani