PROBLEM TO BE SOLVED: To provide a disposable diaper capable of effectively suppressing the generation of eczema such as heat rashes.SOLUTION: A liquid permeable sheet 17 in which antibacterial agent containing polymer coating part 31 is arranged in a non-skin face side is affixed to a posterior torso surrounding area of the diaper body. When a wearer sweats, the sweats transmits through the liquid permeable sheet 17 and permeates to the antibacterial agent containing polymer coating part 31. Thereby antibacterial agent in the antibacterial agent containing polymer coating part 31 flows out into the sweat sterilizes Staphylococcus epidermidis.