To provide simple, economical and effective solutions to these various problems while particularly allowing the use of inter-blade platforms in small-diameter engines.

A turbomachine fan comprises: blades (16) fitted in slots (23) on the periphery of a rotor disk (12); and inter-blade platforms (20) having radial lugs for fastening them to corresponding lugs of the disk (12). Each platform (20) is fastened to the disk (12) by means of a pin (64) inserted into orifices in the lugs of the platform (20) and into corresponding orifices in the lugs of the disk (12).