A biological information detector includes a light-emitting part, a first reflecting part, a light-receiving part, a contact part and a first wiring for the light-emitting part. The light-emitting part is configured to emit light directed at a detection site of a test subject. The first reflecting part includes a reflecting surface configured to reflect the light towards the detection site. The light-receiving part is configured to receive light having biological information from the detection site. The contact part is configured to transmit the light emitted by the light-emitting part, wherein the contact part has a contact surface which is configured to be in contact with the test subject and an opposite surface which is opposite to the contact surface. The first reflecting part and the first wiring are disposed on the opposite surface of the contact part and the light-emitting part is disposed on the first wiring.
