Absorbent article with a concave groove

An absorbent article comprising:

• an absorbent body provided between a liquid permeable topsheet and a backsheet;
• and
• at least a single concave groove for flowing urine therein formed at a skin side surface along a longitudinal direction,
• wherein a transverse plane shape of the concave groove satisfies following conditional expressions (1), (2) and (3),
• (1) a relationship between a depth “h” of a bottom surface of the concave groove, and a distance “S” from a bottom end “G” of the concave groove to an upper end “K” from which a concavity of the concave groove starts is 1.5h<S.
• (2) a relationship between a width “b” of the bottom surface of the concave groove, and a width “B” of a liquid collection area expressed by a distance between the upper ends “K” and “K” at both sides of the concave groove is B≥3b, and
• (3) a relationship between a dimension “a” of a square concave groove expressed by a product of the width “b” of the bottom surface of the concave groove and the depth “h” of the bottom surface, and a cross-sectional dimension “A” of the concave groove is A≥2a, and
• wherein in the concave groove, a density “ρ1” of the absorbent body under the bottom surface is greater than or equal to 1.5 times of a density “ρ2” of the absorbent body at a peripheral general portion which is not compressed.