An apparatus for detecting and signalling the breakage of a roller in a roller conveyor provided with a series of rollers arranged side by side along a feed direction, said apparatus being equipped with a monitoring unit configured to detect the breakage of a roller in a group of rollers of the series of rollers and comprising: - a bar, adapted to be superimposed in plan on one end of the rollers of the group of rollers, the bar of which is provided with a first axial end and a second axial end opposite to the first axial end and movable between a first position, in which the first axial end and the second axial end lie at least partially on respective reference planes, and a second position, in which at least one of either the first axial end or the second axial end is at a higher level than the corresponding reference plane due to the breakage of a roller, - a rod provided with a portion adapted to be in contact with the bar - a connection element configured to maintain said portion of the rod in contact with the bar, wherein the rod is at least partially movable together with the bar through the connection element between a first position which the rod occupies when the bar is in the first position, and a second position, which the rod occupies when the bar is in the second position, wherein the monitoring unit comprises a sensor operatively connected to an electronic control unit of the apparatus and configured to detect the passage of the rod between the first and the second position and generate an activation signal detectable by the electronic control unit when the rod is in the second position, and wherein the electronic control unit is configured to send an alarm signal to an interface device of the apparatus when it detects the activation signal generated by the sensor. - a bar, adapted to be superimposed in plan on one end of the rollers of the group of rollers, the bar of which is provided with a first axial end and a second axial end opposite to the first axial end and movable between a first position, in which the first axial end and the second axial end lie at least partially on respective reference planes, and a second position, in which at least one of either the first axial end or the second axial end is at a higher level than the corresponding reference plane due to the breakage of a roller, - a rod provided with a portion adapted to be in contact with the bar - a connection element configured to maintain said portion of the rod in contact with the bar, wherein the rod is at least partially movable together with the bar through the connection element between a first position which the rod occupies when the bar is in the first position, and a second position, which the rod occupies when the bar is in the second position, wherein the monitoring unit comprises a sensor operatively connected to an electronic control unit of the apparatus and configured to detect the passage of the rod between the first and the second position and generate an activation signal detectable by the electronic control unit when the rod is in the second position, and wherein the electronic control unit is configured to send an alarm signal to an interface device of the apparatus when it detects the activation signal generated by the sensor. wherein the rod is at least partially movable together with the bar through the connection element between a first position which the rod occupies when the bar is in the first position, and a second position, which the rod occupies when the bar is in the second position, wherein the monitoring unit comprises a sensor operatively connected to an electronic control unit of the apparatus and configured to detect the passage of the rod between the first and the second position and generate an activation signal detectable by the electronic control unit when the rod is in the second position, and wherein the electronic control unit is configured to send an alarm signal to an interface device of the apparatus when it detects the activation signal generated by the sensor.