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 temperature control element having a first region thermally connected to the Fabry-Perot interference filter and the light detector and configured to function as one of an endothermic region and an exothermic region, wherein the first region is positioned on the one side with respect to the light detector at least on the line, the light detection device further comprising: a wiring substrate disposed on the first region; and a support member disposed on the wiring substrate, wherein the light detector is disposed on the wiring substrate and the Fabry-Perot interference filter is disposed on the support member, wherein an outer edge of the opening is positioned inside an outer edge of the Fabry-Perot interference filter when seen in a direction parallel to the line, and wherein the temperature control element has a second region thermally connected to the package and configured to function as the other of the endothermic region and the exothermic region, wherein a region of the light transmitting member is joined to an inner surface of a ceiling of the package in an air-tight manner and the outer edge of the light transmitting member is positioned outside the outer edge of the Fabry-Perot interference filter, when seen in a direction parallel to the line. 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 temperature control element having a first region thermally connected to the Fabry-Perot interference filter and the light detector and configured to function as one of an endothermic region and an exothermic region, wherein the first region is positioned on the one side with respect to the light detector at least on the line, the light detection device further comprising: a wiring substrate disposed on the first region; and a support member disposed on the wiring substrate, wherein the light detector is disposed on the wiring substrate and the Fabry-Perot interference filter is disposed on the support member, wherein an outer edge of the opening is positioned inside an outer edge of the Fabry-Perot interference filter when seen in a direction parallel to the line, and wherein the temperature control element has a second region thermally connected to the package and configured to function as the other of the endothermic region and the exothermic region, wherein a region of the light transmitting member is joined to an inner surface of a ceiling of the package in an air-tight manner and the outer edge of the light transmitting member is positioned outside the outer edge of the Fabry-Perot interference filter, when seen in a direction parallel to the line. a wiring substrate disposed on the first region; and a support member disposed on the wiring substrate, wherein the light detector is disposed on the wiring substrate and the Fabry-Perot interference filter is disposed on the support member, wherein an outer edge of the opening is positioned inside an outer edge of the Fabry-Perot interference filter when seen in a direction parallel to the line, and wherein the temperature control element has a second region thermally connected to the package and configured to function as the other of the endothermic region and the exothermic region, wherein a region of the light transmitting member is joined to an inner surface of a ceiling of the package in an air-tight manner and the outer edge of the light transmitting member is positioned outside the outer edge of the Fabry-Perot interference filter, when seen in a direction parallel to the line.