The present technology relates to a solid-state imaging device, a signal processing chip, and an electronic apparatus that make it possible to utilize the result of detecting an occurrence of an event in imaging. The solid-state imaging device includes: an event detection unit that detects, as an event, a change in an electrical signal generated by each pixel of a pixel array unit; a region-of-interest detection unit that detects, from a result of detecting the event, a region-of-interest of the pixel array unit; and a pixel signal generation unit that generates a pixel signal constituting an image of a region corresponding to the region-of-interest. The present technology is applicable to, for example, a sensor that detects an event that is a change in an electrical signal of a pixel.