| 摘要 |
In order to provide a spectrophotometer, which can detect, by means of output intensity signals obtained by a photodetector, the entry of external light at the time of sample cell replacement and the like without providing a door with an opening/closing sensor or the like, a spectrophotometer (60) is provided with: a photodetector (12); a light blocking unit (41); a storage unit (34), which stores a light blocking period where light is blocked by means of the light blocking unit (41) and output intensity signals obtained by the photodetector (12) by corresponding the light blocking periods to the output intensity signals; and a control unit (31b), which calculates transmittance or light absorbance on the basis of the output intensity signals in the light blocking periods, said output intensity signals having been stored in the storage unit (34), and output intensity signals in light entry periods. The spectrophotometer is characterized in that the storage unit (34) stores a threshold for detecting the entry of external light into the photodetector (12), and that the control unit (31c) detects the entry of the external light into the photodetector (12) on the basis of the output intensity signals in the light blocking periods, and the threshold.
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