A component measuring device includes a calibration member that is slidably disposed in an insertion hole of a chip attachment unit and a biasing member that biases the calibration member toward an insertion port. The calibration member is held by the biasing member at a position where the calibration member blocks the introduction port and a lead-out port and where light from a light emitter is applied to the calibration member when a measuring chip is not inserted in the insertion hole, and slides to a side opposite to the insertion port along with insertion of the measuring chip into the insertion hole so that light from the light emitter is applied to the measuring chip.
