Shorts type disposable diaper

A shorts type disposable diaper including a waist opening portion, a pair of leg opening portions, and opposing side portions extending from the waist opening portion to the leg opening portions on opposing lateral sides of said diaper, said diaper comprising:

• an absorptive body including a liquid permeable topsheet, a liquid impermeable backsheet, and an absorber interposed between said topsheet and said backsheet, said absorptive body being divided into a stomach side portion, an under-crotch portion, and a back side portion;
• first and second elastically expansible members positioned at the pair of leg opening portions to extend from the opposing side portions of said diaper around the leg opening portions to the under-crotch portion, then laterally across substantially a center of the under-crotch portion of said diaper, the first and second elastically expansible members being
• nonintersecting and spaced apart from each other generally up to a distance of 20 mm, or
• having a single common overlapping region in the under-crotch portion defined by superimposing the first and second elastically expansible members laterally and across substantially the center of the under-crotch portion of said diaper, said overlapping region including said first and second elastically expansible members lying upon each other in a substantially parallel manner;
• and
• a third continuous elastically expansible member disposed around an entirety of said diaper immediately adjacent the waist opening portion, whereby leakage of waste materials is
• substantially reduced while wearing comfortability is substantially increased.