Patent ID: 8002761

Claim:
An open type disposable diaper that includes: a liquid pervious face sheet; a liquid impervious back sheet; and an absorbent body disposed therebetween, wherein fastening tapes are disposed at edges of both sides of either one of a back side or a front side, the fastening tape is partially or entirely formed of a hook member of a hook and loop fastener, and the hook member is engaged with an engagement section disposed between edges of both sides of a front side or a back side for wearing, characterized in that the engagement section is disposed so as to extend from a center in a width direction of a product toward edges on both sides and the separation strength off the hook member is constituted so as to be different stepwise or continuously from a center portion in a width direction of a product towards edges of both sides and/or from one edge in a vertical direction of a product towards the other edge, wherein the engagement section is: a loop sheet having a configuration where, on a loop element-forming surface of a loop base sheet on which many loop elements are formed, a perforated cover sheet having a plurality of holes is stacked and bonded to engage with a hook member through the loop element-forming surface exposed from the holes of the perforated cover sheet or a portion that is configured so that a range containing a loop member on which many loop elements formed by a fiber of a back sheet per se are formed is covered with a perforated cover sheet having a plurality of holes and, through the loop element-forming surface exposed from the holes, is engaged with the hook member.