To provide a wavelength measuring device and wavelength measuring method capable of performing a precise wavelength measurement with a small- sized, lightweight and inexpensive device.
This wavelength measuring device has a device having photoelectric converter layers A and B of two layers differed in wavelength sensitive characteristic provided on a base plate 3, ammeters 8 and 10 for measuring photoelectrically converted current in each photoelectric converter layer A, B, and an arithmetic means for performing an operation to determine the wavelength on the basis of the current values outputted from the ammeters 8 and 10. In the wavelength measuring method using this device, the wavelength of a light of measuring object is determined by receiving the light of measuring object by the device, measuring the photoelectrically converted current at least in two positions of the optical path of the incident light, introducing the current values outputted from the two positions to an arithmetic equation based on division, and unitarily conforming the resulting calculated value to the wavelength.
SAITO TADASHI
KOBAYASHI NAOKI
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