A continuous rotary filling and packaging machine covers a container body with a molded lid and ultrasonically seals the container body. The molded lid to produce a sealed container includes a lid detecting device 70 disposed on the downstream side of the lid supplying device 60 and an ultrasonic sealing device 100 including lifting and lowering means including a cam mechanism for lifting and lowering a container table 103. The lifting and lowering means is configured such that the molded lid on the container body and a seal working surface of an ultrasonic horn 108 come into press-contact with each other at a top dead point of the container table. A container table lowering control mechanism does not lift, to the top dead point, a container table of a container whose container body does not have the molded lid placed thereon or properly placed thereon as determined.