Biological material measuring instrument

A bioinstrument comprising:

• a main body;
• a rotating body rotatably fixed to the main body, comprising a plurality of cartridge holders each of which is configured to hold a cartridge allowing a reaction between a reagent stored in a cuvette of the cartridge and an analyte in a sample to be loaded therein;
• a cartridge detection sensor installed at the main body;
• a motor connected to the rotating body and rotates the rotating body with respect to the main body;
• and
• a controller configured to drive the motor to successively position each of the plurality of cartridge holders to the cartridge detection sensor and to detect presence of the cartridge loaded therein to detect presence of the cartridge at each of the plurality of cartridge holders to decide whether a rotation balance is obtained, and after it is decided that the rotation balance is obtained then drive the motor to rotate the rotating body with respect to the main body at an angular velocity sufficient to separate a particle component from the sample loaded in the cartridge by centrifugal force,
• wherein the main body comprises at least one light detector configured to receive light from the cartridge holders and optically measure the analyte in the sample,
• wherein the rotating body comprises one or more light receiving optical waveguides to guide light from the plurality of cartridge holders to the at least one light detector, and
• wherein each of the light receiving optical waveguides is installed in surface contact with each of the plurality of cartridge holders.