Optical filter, light detecting device, and light detecting system

An optical filter comprising:

• a filter array including a plurality of filters that is two-dimensionally arrayed, the plurality of filters including a first filter and a second filter, a transmission spectrum of each of the first filter and the second filter having local maximum values of transmittance at three or more wavelengths included in a first wavelength region;
• and
• a band-pass filter that passes light in a second wavelength region including two or more wavelengths of the three or more wavelengths and not including one or more wavelengths of the three or more wavelengths,
• wherein the filter array and the band-pass filter are disposed so that
• (a) the band-pass filter is located on an optical path of transmitted light that passes through the first filter and the second filter or
• (b) the first filter and the second filter are located on an optical path of transmitted light that passes through the band-pass filter.