A unit for receiving and treating capsules containing a basic preparation for an ice cream product includes a retaining unit and an expulsion device. The retaining unit is provided with a retaining housing configured to receive a capsule containing a basic preparation for an ice cream product. The expulsion device comprises a nozzle which is connectable to a compressed air source and which is configured to emit a jet of air in the direction of the retaining unit and adapted to strike the capsule when the latter is inside the retaining housing in such a way as to expel the capsule along an expulsion direction.