To detect and remove defectives with high accuracy under the high speed production by mixing fluorescent in one of members for forming an absorptive article, and utilizing fluorescence emitted from the member to detect whether the member is fitted in a correct position or not.

A throw-away diaper 1 includes a liquid permeable surface sheet 2, a liquid impermeable back sheet 3 and a liquid retaining absorber 4, wherein fastening tapes 5, 5 are arranged on both right and left side edge parts A', A" of the back part A. In this case, fluorescent is mixed in the tape base material of the fastening tapes 5, 5. Thus, in the manufacturing process for the diaper 1, fluorescence emitted from the tape base material is utilized to detect the fastening tapes 5, and judge whether the fastening tapes 5 are fitted in correct positions or not. As a method of mixing fluorescence in the tape base material, for example, fluorescence is applied to the surface of the tape base material.