Plate product using natural stone for floor and wall finishing

A floor or wall finishing plate product using natural stone, comprising:

• a natural-stone surface plate having a predetermined thickness, and cut to have a predetermined length and width;
• a reinforcing plate cut to have a length and width corresponding to those of the natural-stone surface plate, and attached to a lower surface of the natural-stone surface plate;
• and
• a base plate cut to have a length and width which are larger than those of the natural-stone surface plate and attached to a lower surface of the reinforcing plate, an upper layer part of the base plate having a predetermined thickness being pushed horizontally at a first lengthwise side surface and a first widthwise end surface, a lower layer part having a remaining thickness being pushed horizontally at a second lengthwise side surface and a second widthwise end surface, wherein the first lengthwise side surface and the first widthwise end surface comprise a side receiving part and an end receiving part which are recessed horizontally under the reinforcing plate, and the second lengthwise side surface and the second widthwise end surface comprise a side protruding part and an end protruding part which protrude horizontally under the reinforcing plate, and the side protruding part is coupled to the side receiving part and the end protruding part is coupled to the end receiving part, so that finishing plate products are continuously horizontally coupled to each other in lengthwise and widthwise directions.