Light detection device

A filter device, comprising:

• a Fabry-Perot interference filter having a first mirror and a second mirror, a distance therebetween is variable, and provided with a light transmission region on a predetermined line, the light transmission region configured to transmit light corresponding to the distance between the first mirror and the second mirror;
• a package having an opening positioned on a one side of the Fabry-Perot interference filter on the line, the package configured to accommodate the Fabry-Perot interference filter;
• a light transmitting unit including a band pass filter configured to transmit light incident on the light transmission region via the opening;
• and
• a bonding member fixing the light transmitting unit to an inner surface of the package,
• wherein, when viewed from a direction parallel to the line, an outer edge of the Fabry-Perot interference filter is positioned outside an outer edge of the opening, and an outer edge of the light transmitting unit is positioned outside the outer edge of the Fabry-Perot interference filter, and
• the bonding member includes a part protruding outward from the outer edge of the light transmitting unit when viewed from a direction parallel to the line, and covers a partial region of a light emitting surface of the light transmitting unit.