Microplate reader

A microplate reader comprising:

• a housing;
• multiple light projecting/receiving units located on a side of the microplate located within the housing, the number of the light projecting/receiving units being equal to or greater than the number of wells of the microplate, each light projecting/receiving unit comprising a set having a light projecting unit and a light receiving unit that correspond to one of the wells of the microplate;
• a reflection member located on a side of the microplate opposite to a side of the light projecting/receiving units and configured to reflect light having passed through samples stored in the wells from the side of the light projecting/receiving units to the side of the light projecting/receiving units;
• and
• a light guide part disposed between the light projecting/receiving units and the microplate, the light guide part comprising projecting-light guide paths each configured to guide the light emitted from the light projecting unit to the sample, receiving-light guide paths each configured to guide the light reflected by the reflection member and having passed through the sample to the light receiving unit, and a surrounding member comprising a pigment-containing resin surrounding the projecting-light guide paths and the receiving-light guide paths, the pigment-containing resin comprising a pigment having a property of absorbing light.