A device for applying a cosmetic product comprising a reserve (3) of cosmetic product; a support and distribution member (5) connected to the reserve, the support and distribution member having a cosmetic product distribution opening (7) communicating with the reserve; a rotary applicator member (11) having a hub (13) rotatably mounted on the support and distribution member around a longitudinal axis (X), and a porous applicator (15) arranged around the hub. The hub comprises at least one inner channel (67) for distributing the cosmetic product communicating with the distribution opening, the inner channel having at least one outlet opening (77, 79) emerging on an outer surface (73) of the hub covered by the porous applicator, the porous applicator having a first total longitudinal length, the outer surface of the hub having a second total longitudinal length greater than 75% of the first total longitudinal length.