Examples of the thermoplastic resin which can be used in this embodiment of the present invention include polyolefin resins such as a polyethylene resin, a polypropylene resin and an ethylene-propylene copolymer; polycarbonate resins; polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polybutylene naphthalate; polystyrene resins such as an acrylonitrile-butadiene-s