Stick-on sensor device for determining living body abnormality

A stick-on device having an upper exterior body and a light-transmissive lower exterior body, and being configured to stick to a living body, the stick-on device comprising:

• a light emitter disposed inside the stick-on device between the upper exterior body and the lower exterior body, and being configured to emit a detection light;
• a first scattering layer configured to scatter the detection light transmitted through the lower exterior body;
• an adhesive layer that is light-transmissive and attached to the lower exterior body, the detection light scattered by the first scattering layer being incident to the adhesive layer;
• a second scattering layer configured to scatter detection light propagated in the adhesive layer;
• a light receiver disposed inside the stick-on device between the upper exterior body and the lower exterior body, and being configured to receive detection light that is scattered by the second scattering layer, transmitted through the lower exterior body, and incident on the light receiver;
• and
• a processor configured to:
• when an amount of detection light received by the light receiver is less than a predetermined value, determine that a contact state between the stick-on device and the living body is normal, and
• when the amount of detection light received by the light receiver is equal to or greater than the predetermined value, determine that the contact state between the stick-on device and the living body is abnormal.