Body-mounted electronic device, determination reference setting method, and recording medium

The invention provides a body-mounted electronic device, a determination reference setting method, and a program capable of more accurately determining attachment and detachment. A body-mounted electronic device is provided with: a light-emitting unit that emits light of a certain wavelength to a body while the body-mounted electronic device is being mounted on the body; a light receiving unit that measures the amount of incident light of the light of the certain wavelength; a posture measuring unit that measures the posture of the wearing part of the body of the device; and at least one processor, where the at least one processor determines a posture of the wearing portion of the body based on a measurement result of the posture measurement portion, and the at least one processor determines a posture of the wearing portion of the body based on the amount of incident light when the wearing portion of the body is a reference posture. A first reference value for determining whether or not the device is worn on