An apparatus for wavelength division multiplexing and demultiplexing, the apparatus comprising: a first lens block including a lens array at one side of the first lens block; a second lens block including a lens surface corresponding to the lens array and combined with another side of the first lens block; a receptacle having an optical fiber ferrule fixed at a center thereof and stacked on the second lens block; and a base combined with the one side of the first lens block, wherein the first lens block is stacked on the base, the apparatus being characterized in that it further comprises a plurality of thin film filters arranged at the another side of the first lens block corresponding to the lens array and having different wavelength ranges, and in that it further comprises: a substrate on which photoelectric devices are provided; a printed circuit board on which the substrate and a photoelectric device driver circuit are provided; and a reinforcement plate on which the printed circuit board is provided, wherein the reinforcement plate and the base are disposed on opposite sides of the printed circuit board to each other, the reinforcement plate is formed of metal material, the base is formed of high strength plastic including glass, the printed circuit board and the reinforcement plate are bonded by using an adhesive, and the printed circuit board and the base are bonded by using an adhesive. a first lens block including a lens array at one side of the first lens block; a second lens block including a lens surface corresponding to the lens array and combined with another side of the first lens block; a receptacle having an optical fiber ferrule fixed at a center thereof and stacked on the second lens block; and a base combined with the one side of the first lens block, wherein the first lens block is stacked on the base, the apparatus being characterized in that it further comprises a plurality of thin film filters arranged at the another side of the first lens block corresponding to the lens array and having different wavelength ranges, and in that it further comprises: a substrate on which photoelectric devices are provided; a printed circuit board on which the substrate and a photoelectric device driver circuit are provided; and a reinforcement plate on which the printed circuit board is provided, wherein the reinforcement plate and the base are disposed on opposite sides of the printed circuit board to each other, the reinforcement plate is formed of metal material, the base is formed of high strength plastic including glass, the printed circuit board and the reinforcement plate are bonded by using an adhesive, and the printed circuit board and the base are bonded by using an adhesive. a substrate on which photoelectric devices are provided; a printed circuit board on which the substrate and a photoelectric device driver circuit are provided; and a reinforcement plate on which the printed circuit board is provided, wherein the reinforcement plate and the base are disposed on opposite sides of the printed circuit board to each other, the reinforcement plate is formed of metal material, the base is formed of high strength plastic including glass, the printed circuit board and the reinforcement plate are bonded by using an adhesive, and the printed circuit board and the base are bonded by using an adhesive.