SAMPLE DETECTOR AND MEASUREMENT DEVICE EQUIPPED WITH THE SAME

A sample detector (B) includes a member (6) provided with an aperture (60), as well as a light receiving element (5) which receives two light beams directed from a pair of light sources (40, 41) to a detection area (AR) and having passed through the detection area and outputs a signal corresponding to the amount of light received, and determination means (8) for determining whether or not a sample is properly supplied to the detection area (AR) based on the signal. Two light beams emitted from the paired light sources (40, 41) travel through paths defined by the aperture (60) to regions (ARr, ARf) of the detection area (AR) which are positionally deviated from each other. With this arrangement, whether or not a sample is properly supplied to the detection area (AR) is precisely determined without using an expensive component such as an optical lens.