The present invention is a tank suitable to contain high pressure fluids, especially for compressed natural gas used for automotive purposes. The tank has a discoid shape to be easily placed on board of vehicles. The tank comprises a sealed internal core and an external coating made through a twisted coats fiber wrapping of composite material with a very high mechanical tensile resistance. According to some executive variants, the tank internally comprises a reinforcing structure made up of a plurality of elements welded in contact with the internal surface of the core.