A hub bearing assembly, comprising: a hub forming, in a single piece of a first metallic material: a cylindrical portion extending in an axial direction and having a cylindrical outer surface, and a flange extending in a radially outward direction from an axially outer end of the cylindrical portion; a bearing unit, comprising: an outer ring providing two outer raceways for accommodating a first, axially outer row and a second, axially inner row of rolling elements, a first tubular inner ring made of a second metallic material and providing a first raceway for the first row of rolling elements and an inner, axially extending cylindrical cavity, and a second inner ring providing a second raceway for the second row of rolling elements, the second inner ring being fixed on the first tubular inner ring; a cylindrical interstice, formed between the outer cylindrical surface of the hub and the axial cylindrical cavity of the first tubular inner ring, and a bonding material contained in the interstice and integrally joined to the outer cylindrical surface of the hub and the axial cylindrical cavity of the first tubular inner ring. a hub forming, in a single piece of a first metallic material: a cylindrical portion extending in an axial direction and having a cylindrical outer surface, and a flange extending in a radially outward direction from an axially outer end of the cylindrical portion; a bearing unit, comprising: an outer ring providing two outer raceways for accommodating a first, axially outer row and a second, axially inner row of rolling elements, a first tubular inner ring made of a second metallic material and providing a first raceway for the first row of rolling elements and an inner, axially extending cylindrical cavity, and a second inner ring providing a second raceway for the second row of rolling elements, the second inner ring being fixed on the first tubular inner ring; a cylindrical interstice, formed between the outer cylindrical surface of the hub and the axial cylindrical cavity of the first tubular inner ring, and a bonding material contained in the interstice and integrally joined to the outer cylindrical surface of the hub and the axial cylindrical cavity of the first tubular inner ring. a cylindrical portion extending in an axial direction and having a cylindrical outer surface, and a flange extending in a radially outward direction from an axially outer end of the cylindrical portion; a bearing unit, comprising: an outer ring providing two outer raceways for accommodating a first, axially outer row and a second, axially inner row of rolling elements, a first tubular inner ring made of a second metallic material and providing a first raceway for the first row of rolling elements and an inner, axially extending cylindrical cavity, and a second inner ring providing a second raceway for the second row of rolling elements, the second inner ring being fixed on the first tubular inner ring; an outer ring providing two outer raceways for accommodating a first, axially outer row and a second, axially inner row of rolling elements, a first tubular inner ring made of a second metallic material and providing a first raceway for the first row of rolling elements and an inner, axially extending cylindrical cavity, and a second inner ring providing a second raceway for the second row of rolling elements, the second inner ring being fixed on the first tubular inner ring; a cylindrical interstice, formed between the outer cylindrical surface of the hub and the axial cylindrical cavity of the first tubular inner ring, and a bonding material contained in the interstice and integrally joined to the outer cylindrical surface of the hub and the axial cylindrical cavity of the first tubular inner ring.