Method of producing the mesh has a mesh body of a resin and a process for producing a mesh provided with a reinforcing member made of resin for reinforcing the mesh body, the resin of the first plurality of through by the laser to the mesh-forming area material film holes step of forming, a step of forming an opening in the second film material of the resin, and the step of placing together and with 1 film material and stacking the second film member, the position corresponding to the mesh-forming area and opening and , a first film material and the second film material comprises the step of joining by laser welding around the opening.