A hook member 30 couples with a target object 150 by superposiug a surface 110a side on which an adhesive layer 121 and projections 130 are formed with the target object 150 (back sheet 11 of a diaper 1). In a state in which the hook member 30 and the target object 150 are coupled, the adhesive layer 121 adheres to the target object 150, and a portion of a column section 131 and the engaging part 132 of the projection 130 penetrate into a gap of the target object. Here, a dimension b in the Z-axis direction between the tip end of the projection 130 and a surface 121a of the adhesive layer 121 is from 0.1 to 0.5 mm. By setting the projection 130 to this type of dimension, the projection 130 can engage with the target object 150 with sufficient engaging force even without interposing a loop member.一種鉤構件30藉由重疊一黏著劑層121及突出物130形成於其上的一表面110a側與一目標物體150(一尿布1的背片材11)而與該目標物體150耦接。在該鉤構件30及該目標物體150耦接的狀態中，該黏著劑層121黏附至該目標物體150，且一柱區段131之一部分及該突出物130的嚙合部132穿透至該目標物體的一間隙中。此處，該突出物130的尖端與該黏著劑層121的一表面121a之間在該Z軸方向的一尺寸b係從0.1mm至0.5mm。藉由將該突出物130設定為此類型的尺寸，即使不插入一環構件，該突出物130可以足夠的嚙合力而與該目標物體150嚙合。
