PURPOSE: To obtain a synthetic resin sheet, disintegrated and/or decomposed quickly in decomposing medium, such as mud, rubbish or compost, or air, in a curing sheet employed in agriculturing, civil engineering, building works and the like, or various sheets employed for covering materials, leisure and the like.

CONSTITUTION: A decomposable synthetic resin sheet is characterized by that a resin coating layer, containing 50wt.% or more of reproduced resin material, is formed on at least one side of a fabric, woven by employing flat yarns, manufactured by extruding polyolefin synthetic resin, melted at 180-250°C after adding 1-15wt.% of decomposable organic substance, such as starch, modified starch and the like, as warp and weft.