PROBLEM TO BE SOLVED: To provide a disposable diaper for satisfying needs to visibly change a picture pattern during use and satisfying needs to make it difficult to generate color irregularities even when a color is changed in a wide range.SOLUTION: The disposable diaper 1A includes a vertically long absorbent body 5 having: a surface sheet 2 a back surface sheet 3 and an absorber 4 disposed between the sheets 2 and 3. Then, the disposable diaper 1A is sectioned into an abdominal side part A, a back side part B and an inseam part C. For the disposable diaper 1A, at least one sheet material, which is a constituent material of the disposable diaper that is visible from the outer side when the diaper is worn, is formed using, at least partially, nonwoven fabric composed of fibers containing a photochromic compound or a thermochromic compound.
