Detection device

A detection device comprising:

• a photodiode comprising a lower electrode, a lower buffer layer, an active layer, an upper buffer layer, and an upper electrode;
• a first substrate;
• a first insulating layer located between the first substrate and the photodiode;
• a second substrate that covers at least the photodiode so as to sandwich the photodiode between the first substrate and the second substrate, and has an area smaller than the first substrate;
• a second insulating layer located between the second substrate and the photodiode;
• an active area comprising the active layer of the photodiode;
• a coupling area in which a coupling part provided at an end of the first substrate is located;
• a peripheral area between the active area and the coupling area;
• a sealing film that seals the active area and the peripheral area;
• and
• a first wiring line that couples the lower electrode to the coupling part, wherein
• the peripheral area comprises:
• a first portion that comprises the first insulating layer, the sealing film, the second insulating layer, and the second substrate on the first substrate;
• and
• a second portion comprising the first insulating layer on the first substrate,
• a boundary line between the first portion and the second portion intersects the first wiring lines along a second direction intersecting the first direction from the coupling area toward the active area,
• a flexible printed circuit board is coupled to the coupling area,
• a protective film covers the second substrate so as to overlap an entire surface of the active area and extends to the peripheral area, and
• a portion of the flexible printed circuit board is sandwiched between the protective film and the first substrate.