To provide a rotary automatic packaging machine capable of coping with change in dimension of a packaging shape, facilitating an assembling work as the automatic packaging machine, decreasing cost of parts, and facilitating a maintenance work.

At least one among a first cam 76 for guiding a first roller 74 actuating a pair of seal bars 72 and 73, a second cam 201 for guiding a second roller 79 moving up and down a chute 10 for a substance to be filled, and a third cam 205 for guiding a third roller 203 moving up and down a shaft 78 fitted with the chute 10, is separable and can be assembled and adjusted.