Automatic driving assistance device, automatic driving assistance method, and automatic driving assistance program

Provided is an automatic driving assistance device that reduces the burden on a driver at the time of switching from automatic driving to manual driving. Disclosed is an automatic driving assistance device in an automatic driving vehicle that automatically performs at least a portion of vehicle control consisting of steering, braking, and acceleration/deceleration within a predetermined travel section, the automatic driving assistance device comprising: a switching section determination unit that determines a section, among said travel section, in which a first load based on the shape or structure of a road is less than or equal to a predetermined threshold to be a switching section for switching at least a portion of said vehicle control from automatic to manual; a driving load measurement unit that, when the automatic driving vehicle enters the determined switching section, measures a second load based on the travel state of other vehicles in the periphery of the automatic driving vehicle; and a driving switching unit that determines a timing at which the measured second load satisfies a predetermined condition to be a switching timing for switching from automatic to manual, and switches from automatic to manual at the determined switching timing.