An apparatus for continuously manufacturing panels made of expanded plastic material, comprising: a lower frame; an upper frame; a lower conveyor; an upper conveyor, said lower and upper conveyors being supported at said lower and upper frames, respectively, and coupled to each other so as to form and delimit a region for containing/retaining and advancing an expanded plastic panel being manufactured; and sensing means for sensing pressure developped by the expanding plastic material introduced within said region to form said expanded plastic panel.