PROBLEM TO BE SOLVED: To provide an in vivo decomposable/absorbable nonwoven fabric which is a nonwoven fabric used in vivo and is rapidly decomposed and absorbed and lends itself effectively as a base material and scaffolding for regeneration medicine purposed for, for example, bioreduilding, as a buffer material between various kinds of implant and living tissue and as tape base material for in vivo medical tacky adhesive tapes. SOLUTION: This nonwoven fabric is constituted by entangling and welding fibers consisting of in vivo decomposable/absorbable polymers having a fiber diameter of 0.5 to 50 &mum and a fiber length of 3 to 100 mm with and to each other. The equally good alternative is to form a skin layer on one surface or to make the fibers porous. A polymer solution prepared by dissolving the in vivo decomposable/absorbable polymers in a volatile solvent is sprayed under fibrillation by jet gas to freely air permeable or air impermeable bodies to be jetted, by which ten nonwoven fabric having the skin layer on one surface or having no skin layer is made. The nonwoven fabric of the porous fibers is made if a polymer solution prepared by dissolving the polymers into a solvent mixture composed of the solvent and a non-solvent having the boiling point higher than the boiling point of the solvent is used.
