Method for producing a solid one-piece cage made of metal material for a spherical roller bearing from an annular blank part defining an axis of revolution, wherein: - a semi-finished part is obtained by machining the blank part using at least one machining tool, so as to form cells in the semi-finished part which are separated in pairs by spacers which are distributed at a distance from one another around the periphery of an end ring (28, 30) of the semi-finished part and which each extend from the end ring (28, 30) in a direction contained in an axial plane, each cell being symmetrical with respect to a plane of symmetry of the cell, containing the axis of revolution, each of the spacers comprising two opposite cell side walls, each of the cell side walls being associated with one of the cells and being formed by a ruled surface having, at any point, a straight generatrix parallel to a direction of penetration of the machining tool and perpendicular to a reference plane of the associated cell, the reference plane being perpendicular to the plane of symmetry of the associated cell and forming a predetermined angle (θ) with the axis of revolution of the cage, each of the cell side walls comprising two planar or concave guide facets (46.1, 46.2) extending one on one side of a median plane of the associated cell and the other on an opposite side of the median plane of the cell, the median plane being perpendicular to the plane of symmetry of the associated cell and to the reference plane of the associated cell, each of the spacers of the semi-finished part comprising an outer radial face facing radially away from the axis of revolution of the cage, then - the cage is finished from the semi-finished part, including the formation on each spacer of tongues projecting toward the adjacent cells and grinding of the guide facets (46.1, 46.2); characterized in that - each cell side wall of the semi-finished part comprises a groove (46.3) which is located between the two guide facets (46.1, 46.2) and is set back relative to the two guide facets (46.1, 46.2), the two guide facets (46.1, 46.2) of each cell side wall, after finishing the cage, being shaped such that there is at least one circle which is positioned in a section plane (A-A, B-B) parallel to the reference plane of the associated cell and is simultaneously tangent at a single point with each of the two guide facets (46.1, 46.2) of the cell side wall, the radius of the circle being less than the radius of curvature measured at any point on each of the two guide facets (46.1, 46.2) in the section plane (A-A, B-B). - a semi-finished part is obtained by machining the blank part using at least one machining tool, so as to form cells in the semi-finished part which are separated in pairs by spacers which are distributed at a distance from one another around the periphery of an end ring (28, 30) of the semi-finished part and which each extend from the end ring (28, 30) in a direction contained in an axial plane, each cell being symmetrical with respect to a plane of symmetry of the cell, containing the axis of revolution, each of the spacers comprising two opposite cell side walls, each of the cell side walls being associated with one of the cells and being formed by a ruled surface having, at any point, a straight generatrix parallel to a direction of penetration of the machining tool and perpendicular to a reference plane of the associated cell, the reference plane being perpendicular to the plane of symmetry of the associated cell and forming a predetermined angle (θ) with the axis of revolution of the cage, each of the cell side walls comprising two planar or concave guide facets (46.1, 46.2) extending one on one side of a median plane of the associated cell and the other on an opposite side of the median plane of the cell, the median plane being perpendicular to the plane of symmetry of the associated cell and to the reference plane of the associated cell, each of the spacers of the semi-finished part comprising an outer radial face facing radially away from the axis of revolution of the cage, then - the cage is finished from the semi-finished part, including the formation on each spacer of tongues projecting toward the adjacent cells and grinding of the guide facets (46.1, 46.2); characterized in that - each cell side wall of the semi-finished part comprises a groove (46.3) which is located between the two guide facets (46.1, 46.2) and is set back relative to the two guide facets (46.1, 46.2), the two guide facets (46.1, 46.2) of each cell side wall, after finishing the cage, being shaped such that there is at least one circle which is positioned in a section plane (A-A, B-B) parallel to the reference plane of the associated cell and is simultaneously tangent at a single point with each of the two guide facets (46.1, 46.2) of the cell side wall, the radius of the circle being less than the radius of curvature measured at any point on each of the two guide facets (46.1, 46.2) in the section plane (A-A, B-B).