Input operation device

An input operation device comprising:

• a substrate;
• a first light-emitting section disposed on an upper surface of the substrate;
• a second light-emitting section disposed on the upper surface of the substrate;
• a third light-emitting section disposed on the upper surface of the substrate;
• a first light guide body which has an upper surface section and a side surface section, and has a first mark and a second mark formed on a lower surface of the upper surface section;
• and
• a second light guide body having an upper surface section and a side surface section,
• wherein
• an upper end of the side surface section of the first light guide body is connected to the upper surface section of the first light guide body, and a lower end of the side surface section of the first light guide body faces the first light-emitting section and the second light-emitting section,
• the first mark emits light on the upper surface section of the first light guide body when light is incident on the first light guide body from the first light-emitting section,
• the second mark emits light on the upper surface section of the first light guide body when light is incident on the first light guide body from the second light-emitting section,
• the upper surface section of the second light guide body emits light when light is incident on the second light guide body from the third light-emitting section, and
• at least one of the first light-emitting section, the second light-emitting section, and the third light-emitting section is capable of changing light emission luminance.