A wetness indicator 10 including coated regions 11S and 12S coated with a color changing agent that changes color on contact with water extends in the longitudinal direction X straddling at least the crotch portion B and the rear portion C. The indicator 10 in the crotch portion C continuously extends with a uniform width. The indicator 10 has a less visible portion 13 with lower post-color change visibility than the other part of the indicator 10 and highly visible portions 11 and 12 with higher post-color change visibility than the less visible portion 13 in only the rear-side region 10P of the indicator 10. The less visible portion 13 is formed of a non-coated region 13A having no color changing agent over the whole length of the indicator 10 in the transverse direction Y.於背面片材3與吸收體4之間,包含藉由與水分接觸而變色之劑之塗佈部11S、12S而構成的指示劑部10以至少遍及胯下部B及背側部C沿縱向X延伸之方式形成。胯下部B中之指示劑部10係以呈同一寬度連續地延伸之方式形成。僅於指示劑部10之背側區域10P設置有如下構件:低視認性部13,其與指示劑部10之其他部位相比,變色後之上述變色之劑之塗佈部的視認性較低;及高視認性部11、12,其等與該低視認性部13相比,該視認性較高。低視認性部13包括遍及指示劑部10之橫向Y之全長未塗佈上述變色之劑之非塗佈部13A。1‧‧‧尿布1a‧‧‧尿布之縱向之一端部1c‧‧‧尿布之縱向之另一端部2‧‧‧正面片材4‧‧‧吸收體5‧‧‧腰部6‧‧‧腿部8‧‧‧黏扣帶9‧‧‧被固定區域10‧‧‧指示劑部10a‧‧‧指示劑部之腹側部側之縱向端部10c‧‧‧指示劑部之背側部側之縱向端部10P‧‧‧指示劑部之背側區域11‧‧‧高視認性部11S‧‧‧塗佈部12‧‧‧高視認性部12S‧‧‧塗佈部13‧‧‧低視認性部13A‧‧‧非塗佈部30‧‧‧透濕性片材31‧‧‧不織布35‧‧‧設計要素40‧‧‧吸收性芯體41b‧‧‧第2包芯片材51‧‧‧腰部彈性構件61‧‧‧腿部彈性構件A‧‧‧腹側部B‧‧‧胯下部C‧‧‧背側部L‧‧‧低視認性部之縱向之長度X‧‧‧縱向Y‧‧‧橫向
