Wiring box and method of mounting the same

A method of mounting a wiring box comprising:

• a top plate having an opening;
• a lid body which opens and closes the opening of the top plate;
• and a rotating arm, one end of the rotating arm being rotatably supported inside the opening of the top plate and another end of the rotating arm rotatably supporting the lid body, wherein the lid body is elevated while being held in a substantially vertical state inside the opening of the top plate by rotation of the rotating arm, and the opening of the top plate is closed by rotation of the lid body at a surface of the opening of the top plate so that a surface of the top plate and a surface of the lid body form a uniform surface, the method comprising the steps of:
• providing, at a lower surface of the top plate, a plurality of mounting holes in a periphery of the opening of the top plate;
• providing a plurality of mounting metal fittings in a periphery of the wiring box;
• and
• making a height from the surface of the lid body to the mounting metal fittings to be substantially equal to a height from the surface of the top plate to the mounting holes so that the surface of the top plate and the surface of the lid body form a uniform surface when the wiring box is mounted from below the opening of the top plate.