A variable sensitivity imaging device comprises: a substrate; a photosensitive layer which is stacked above the substrate, and which is interposed between a pixel electrode layer and an opposing electrode layer; a signal reading section, formed on the substrate, that reads a signal corresponding to photo-charges which are generated by incidence of light into the photosensitive layer; and a pulse voltage applying section that applies a variable pulse-width pulse voltage between the pixel electrode layer and the opposing electrode layer.