A swimming pool comprising a perimetral structure supporting the water holder being made of plastics material and is characterized in that the perimetral structure is apt to rest on the surface on which the swimming pool is to be installed, the perimetral structure comprising tensioning members being fitted to it and transversally arranged from side to side of the perimeter in an underlying arrangement. The perimetral structure comprises base supports being transversally arranged along the swimming pool perimeter and joined together by means of a backwardly arranged side member, the base supports frontally supporting the panels that will make up the swimming pool contour. The tensioning members are made up of ropes being provided with means to adjust their tensioning.
