Detection device

A detection device that is wearable on one finger, the detection device comprising:

• a first electrode having an inner surface adapted to be in contact with a finger wearing the detection device;
• a second electrode provided outside relative to the first electrode when the detection device is worn and electrically insulated from the first electrode;
• a light source provided outside relative to the first electrode and inside relative to the second electrode and adapted to irradiate the finger with light;
• a light sensor provided outside relative to the first electrode and inside relative to the second electrode and adapted to receive light from the finger;
• a control circuit provided outside relative to the first electrode and inside relative to the second electrode and configured to measure biological information based on an output from the light sensor;
• and
• an insulating part provided on part of an outer surface of the second electrode,
• wherein
• the light source includes at least one of a red light source, an infrared light source, a near-infrared light source, and a green light source,
• part of the second electrode not covered by the insulating part is exposed and part of the second electrode covered by the insulating part is not exposed,
• the second electrode is provided all around the first electrode of the detection device that has a ring shape, and
• the insulating part is provided covering two parts of an outer surface of the second electrode, the two parts being opposed to each other in a radial direction of the detection device.