PURPOSE: To enable the back sheet of a body fluid disposal article to have both gas permeable and through-vision features.

CONSTITUTION: A polyolefine plastic sheet containing an inorganic filler particles is drawn, and subjected to a thermal embossing treatment, thereby obtaining a back sheet 1. The surface of the sheet 1 is constituted of a rough section 5 and a smooth section 6, and both sections 5 and 6 are made to form the predetermined surface pattern. In addition, gas permeable fine holes 7 are formed on the rough section 5, while the smooth section 6 is so made as to allow the easy through-vision of an absorbent material in a body fluid disposal article.