Rolling bearing comprising: - a first ring, the first ring defining a first continuous raceway, - a second ring, said first and second rings (11, 12) each having a central axis, the central axes of the first and second rings being parallel with one another, said first and second rings (11, 12) being radially spaced apart by a first annular space, and said second ring comprising a first ring part (12 1) and a second ring part (12 2), - a third ring, the third ring defining a fourth continuous raceway, the third ring having a central axis, the central axes of the third and second rings being parallel with one another, said second and third rings (12, 13) being radially spaced apart by a second annular space, - a first row of rolling bodies disposed in the first annular space and coupling said first ring and said second ring in rotation, and - a second row of rolling bodies disposed in the second annular space and coupling said second ring and said third ring in rotation, roller bearing in which the first and second ring parts (12 1, 12 2) are displaceable relative to one another between a filling configuration, in which the first annular space and the second annular space are accessible so that the rolling bodies of the first and second rows of rolling bodies (20, 22) can be introduced into and/or removed from the first and second annular spaces, and an assembly configuration in which the first and second ring parts (12 1, 12 2) of the second ring together form a second and a third continuous raceway (17, 18), a part of each of the second and third raceways (17, 18) being disposed on each of the first and second ring parts (12 1, 12 2) of the second ring, said first and second raceways (16, 17) co-operating with each of the rolling bodies of the first row of rolling bodies, and said third and fourth raceways (18, 19) co-operating with each of the rolling bodies of the second row of rolling bodies, characterised in that the first ring part (12 1) comprises a cut-out, and the second ring part (12 2) forms a cover element of said cut-out, said cut-out opening into the first annular space and into the second annular space to enable the rolling bodies of the first and second row of rolling bodies (20, 22) to be inserted via said cut-out. - a first ring, the first ring defining a first continuous raceway, - a second ring, said first and second rings (11, 12) each having a central axis, the central axes of the first and second rings being parallel with one another, said first and second rings (11, 12) being radially spaced apart by a first annular space, and said second ring comprising a first ring part (12 1) and a second ring part (12 2), - a third ring, the third ring defining a fourth continuous raceway, the third ring having a central axis, the central axes of the third and second rings being parallel with one another, said second and third rings (12, 13) being radially spaced apart by a second annular space, - a first row of rolling bodies disposed in the first annular space and coupling said first ring and said second ring in rotation, and - a second row of rolling bodies disposed in the second annular space and coupling said second ring and said third ring in rotation,