PROBLEM TO BE SOLVED: To provide an underpants type absorbent article which is excellent in preventing moving and falling down, scarcely applies a pressure mark on an elastic member, and scarcely applies a burden on the skin.SOLUTION: When shrinking stresses in the article width direction per unit length in the article longitudinal direction of first-third regions A1-A3 and an abdomen side extension part A4 in an abdomen side sheet member 2A are expressed as P-P, shrinking stresses per elastic member in the article width direction are expressed as Q-Q, and shrinking stresses related to first-third regions B1-B3 and a backside corresponding part B4 in a backside sheet member 2B are expressed as P-Pand Q-Q, a diaper 1 satisfies following equations: Ratio (P/P)>ratio (Q/Q), ratio (P/P)>1...(1), ratio (P/P)>ratio (Q/Q), ratio (P/P)>1...(2), ratio (P/P)>ratio (Q/Q), ratio (P/P)>1...(3), and ratio (P/P)>ratio (Q/Q), ratio (P/P)>1....(4).
