NOVELTY - The unit (32) has a magnet holder (42) holding magnets (43), where the holder includes partitioning portions (60) that extend vertically along an outer peripheral surface of an annular rotor core (41). A coupling portion (70) connects the partitioning portions, where the rotor core and the holder are fixed by insert molding. A portion of resin that constitutes the holder is present between a set of steel sheets that constitutes the rotor core in the outer peripheral surface of the rotor core. The magnets are press-fitted into a pair of the partitioning portions that is mutually adjacent.    USE - Rotor unit for a rotating electrical machine (claimed) i.e. motor, for generating driving force for power steering of an automobile. Can also be used for a generator for an electric motorcar, an electric power-assisted bicycle, an electric motorcycle, a home electronic, outdoor action (OA) equipment, a medical instrument, and an electric power-assisted bicycle and wind power generation.    ADVANTAGE - The rotor core and the holder are fixed by insert molding, so that process of manufacturing the rotor core and the holder is shortened. The outer peripheral surface of the rotor core and a portion of resin that constitutes the holder are present between the steel sheets that constitute the rotor core, so that fixing strength of the rotor core and the holder is improved. The unit suppresses separation between the rotor core and the holder, so that the magnet can be easily press-fitted. The unit includes a recess sealed by a lower surface of the magnet after press-fitting and becomes a closed space, so that scattering of dust received in the recess to the outside is prevented. The magnet is press-fitted into the magnet holder after insert molding is completed and hardening is made, so that the time and effort to adhere the magnet to the rotor core can be saved and the magnets can be easily positioned with high precision.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a rotating electrical machine comprising a stationary portion    (2) a method for manufacturing a rotor unit for a rotating electrical machine.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a rotor unit.    Rotor unit (32)    Annular rotor core (41)    Magnet holder (42)    Holding magnets (43)    Partitioning portions (60)    Coupling portion (70)