Biodecomposable or biodisintegrable moldable material

A biodecomposable or biodisintegrable moldable material in the form of porous granules each having a diameter of 0.1-20 mm and including (a) a plurality of thermoplastic resin particles which are fuse-bonded to each other, (b) a naturally-occurring high molecular weight substance which is in the form of particles having an average volume within the range of 4.2.times.1/10.sup.3 .mu.m.sup.3 -520.times. 10.sup.3 .mu.m.sup.3 or in the form of fibers having a diameter of less than 100 .mu.m and a length of less than 10 mm, and (c) a filler which is in the form of particles having an average volume within the range of 4.2.times.1/10.sup.3 .mu.m.sup.3 -910.times.10.sup.3 .mu.m.sup.3 or in the form of fibers having a diameter of less than 100 .mu.m and a length of less than 10 mm, said naturally-occurring high molecular weight substance and said filler being attached to the outer surfaces of said thermoplastic resin particles, said thermoplastic resin, said naturally-occurring high molecular weight substance and said filler being present in amounts of 30-70% by volume, 10-70% by volume and 0-45% by volume, respectively.