A light-emitting detection device that: generates beams of light by separately focusing light emitted from light-emission points of a light-emission point array using focusing lenses of a focusing lens array; causes the beams of light to be incident at a sensor in parallel; and detects the beams of light. The diameter of the light-emission points, the focal length and interval of the focusing lenses, and the optical path length of the focusing lenses and the sensor are made to satisfy a prescribed relationship, and, as a result, the light-emitting detection device is smaller and achieves highsensitivity and low crosstalk.