A refillable cosmetic product container device that is configured to receive a refill configured to contain the cosmetic product by an opening in order to put it in place in a reception volume defined by an inside wall of the casing. The inside wall has, over at least part of its surface, a member made of elastomer material connected to the casing and which is at least partly in relief relative to the inside wall of the casing. The casing thus formed is able to hold a refill in the reception volume, by virtue of the members in relief of elastomer material formed on the inside wall of the casing. The invention also relates to a casing for a cosmetic product container device comprising a casing and such a refill.