PURPOSE: To produce an m-aramide paper having a conductivity suitable for a shielding material or an electric field relaxation material and provide its production method.

CONSTITUTION: This synthetic paper substantially comprises an organic heat- resistant fiber including electroconductive fine particles and m-aramide fibrids. In a desired embodiment, m-aramide fibers are used as the organic heat-resistant fibers and the electroconductive fine particles are carbon particles. The synthetic paper preferably has a volume resistivity of 102-108Ωcm and a surface resistance of 102-1010Ω. The synthetic paper is produced by dispersing electroconductive fine particles in a molten organic heat-resistant polymer or in a solution of an organic heat-resistant polymer, spinning an organic heat-resistant fiber from the molten polymer or the solution, cutting the fiber, mixing the cut fibers with m-aramide fibrids to form a slurry, paper-making from the slurry, dewatering and drying, or further heat-pressing the paper.