A popcorn making machine is proposed in three embodiments including a roaster, provided with a circulated hot airflow, and a pipebranch coupled thereto, receiving popcorn from the roaster and discharging thereof. In the first embodiment, the roaster has truncated conical sidewalls, the pipebranch has a rectangular cross-section. In the second embodiment the roaster is configured as at least a portion of a deformed sphere having a lesser pole radius and a greater equator radius, the pipebranch is conjugated with the roaster without any acute angle, and continuously tapers transforming into a cylindrical shape. In the third preferred embodiment, the roaster and pipebranch are similar to the ones of the second embodiment, but the roaster additionally contains a central cavity configured in a cone-like shape, having a base, a cupola-like top, and a curved conjugation angle at the base. The aforementioned shapes reduce manufacturing costs and improve the popcorn machines productivity.
