<p>Disclosed is a continuous rotary filling and packaging machine which places a shaped lid P onto a container body B and heat-seals it to produce a sealed container, equipped with a sealing device which greatly reduces the occurrence of imperfectly mounted lids caused by the lid not being properly mounted onto the container body. The continuous rotary filling and packaging machine places a shaped lid onto the container body, then mounts the shaped lid to the container body ultrasonically to produce a sealed container. The continuous rotary filling and packaging machine consists of a lid detector (70) positioned downstream of a lid feed unit (60), a means for raising and lowering consisting of a cam mechanism which raises and lowers a container platform (103) disposed such that the top of the container body and the shaped lid on the top dead centre of the container platform are pressed against the operating surface of the ultrasonic horn (108), and an ultrasonic sealing device (100) provided with a control mechanism which does not raise the container platform to said top dead centre position if it judges the container body to have no lid or an incorrectly mounted lid.</p>
