The present disclosure relates to a tubular rotator (15) for a medicament delivery device comprising a medicament delivery member cover and a sensor arrangement, wherein the tubular rotator (15) comprises: a guide structure (16) arranged to convert linear motion of the medicament delivery member cover to rotational motion of the tubular rotator (15), and a profiled distal edge periphery (15b) arranged to interact with the sensor arrangement for actuating the sensor arrangement. There is also provided a medicament delivery device comprising such a tubular rotator.
