Portable stackable grandstand with total length of 10 mt made of 4 seating modules and one module with access steps that can alternate in any different positions; each module can be tipped-up and rolled away on proper wheels installed on back side of structure; different modules can be stocked on wheels one inside the others thanks to the different length (280, 240, 200, 160 and 120 cm); varnished steel structure (color on demand), varnished wooden panels on seating area, anti-slip surface wooden panels on walking area and steps; foldable backrest on last seating row; for indoor use