The sensor on a dashcam is like the human eye; it is where light enters to be later processed into moving images. The sensor consists of multiple light-sensitive elements that work together to create the most realistic image of reality possible.

The sensor in a dashcam, along with the chip, is the most important indicator of image quality. The best-known manufacturer of image sensors is Sony. Sony's sensors are also used, for example, in GoPro action cameras.