Light detection device

A light detection device comprising:

• a Fabry-Perot interference filter having a first mirror and a second mirror with a variable distance therebetween and provided with a light transmitting region transmitting light corresponding to the distance between the first mirror and the second mirror on a predetermined line;
• a light detector disposed on one side with respect to the Fabry-Perot interference filter on the line and configured to detect light transmitted through the light transmitting region;
• a package having an opening positioned on the other side with respect to the Fabry-Perot interference filter on the line and configured to accommodate the Fabry-Perot interference filter and the light detector;
• a light transmitting member provided in the package such that the opening is blocked;
• and
• a first band-pass filter being a dielectric multilayer film provided on a light emitting surface of the light transmitting member,
• wherein the light transmitting member is fixed to the package with the first band-pass filter interposed therebetween.