Abstract: An apparatus for manufacturing a bath sponge having incorporated therein a core of detergent substances is disclosed, comprising a plurality of containers 2 for receiving a sponge, apertured at their bottom; means for advancing the containers while swinging the containers in a plane substantially parallel to the advancement plane; a cutting station having a rod-like blade rotatable about its longitudinal axis, for insertion through the apertured container into the sponge; a station for feeding a detergent in paste-like condition, downstream of the cutting station and provided with a delivery nozzle for insertion through the apertured container into the sponge.