Rotor for a rotary electric machine, able to interact with a stator of the rotary electric machine and rotating with respect to an axis of rotation, the rotor comprising: - a rotor body comprising: - first cavities extending from a first end of the rotor body to a second end of the rotor body in the direction of the axis of rotation, - third cavities extending from the first end of the rotor body to the second end of the rotor body in the direction of the axis of rotation and having an axis parallel to the axis of rotation, - permanent magnets housed in the first cavities, a fixing space being formed between at least a first face of at least one of the permanent magnets and a second face of one of the first cavities in which the at least one permanent magnet is housed, - a first retaining assembly bearing against the first end of the rotor body, and comprising second holes, - a second retaining assembly bearing against the second end of the rotor body, - tie rods, passing through the third cavities and through the second holes in the first retaining assembly, so that the rotor body can be clamped between the first retaining assembly and the second retaining assembly, - a resin introduced into the fixing space, wherein the first retaining assembly comprises a supply passage communicating with the fixing space, the supply passage being able to receive a resin supply device, characterized in that the first retaining assembly comprises a counterbore having a bottom, the bottom comprising the supply passage and a planar bearing surface on which the tie rod bears, the supply passage and the bearing surface having an edge in common so as to leave no material of the first retaining assembly between a portion of the tie rod resting on the planar bearing surface and the supply passage. - a rotor body comprising: - first cavities extending from a first end of the rotor body to a second end of the rotor body in the direction of the axis of rotation, - third cavities extending from the first end of the rotor body to the second end of the rotor body in the direction of the axis of rotation and having an axis parallel to the axis of rotation, - permanent magnets housed in the first cavities, a fixing space being formed between at least a first face of at least one of the permanent magnets and a second face of one of the first cavities in which the at least one permanent magnet is housed, - a first retaining assembly bearing against the first end of the rotor body, and comprising second holes, - a second retaining assembly bearing against the second end of the rotor body, - tie rods, passing through the third cavities and through the second holes in the first retaining assembly, so that the rotor body can be clamped between the first retaining assembly and the second retaining assembly, - a resin introduced into the fixing space, wherein the first retaining assembly comprises a supply passage communicating with the fixing space, the supply passage being able to receive a resin supply device, - first cavities extending from a first end of the rotor body to a second end of the rotor body in the direction of the axis of rotation, - third cavities extending from the first end of the rotor body to the second end of the rotor body in the direction of the axis of rotation and having an axis parallel to the axis of rotation, - permanent magnets housed in the first cavities, a fixing space being formed between at least a first face of at least one of the permanent magnets and a second face of one of the first cavities in which the at least one permanent magnet is housed, - a first retaining assembly bearing against the first end of the rotor body, and comprising second holes, - a second retaining assembly bearing against the second end of the rotor body, - tie rods, passing through the third cavities and through the second holes in the first retaining assembly, so that the rotor body can be clamped between the first retaining assembly and the second retaining assembly, - a resin introduced into the fixing space, wherein the first retaining assembly comprises a supply passage communicating with the fixing space, the supply passage being able to receive a resin supply device,