A supporting plate for a cosmetic product (P), includes a hollow region (C) for receiving the cosmetic product, and a retaining part (22; 44; 67; 105; 206, 207) which is protruding from the sidewall of the hollow region (C), for retaining the cosmetic product and avoiding its detachment from the plate. Examples refer to embodiments wherein the supporting plate is made by two or more elements joined together, or molded in a single piece. The main advantageous effect is that glue is no longer required to fix the cosmetic product on the supporting plate.