Biological information detection apparatus and method

A biological information detection apparatus comprising:

• a light emitter configured to emit a light onto a subject;
• a light receiver configured to detect a biological signal from the light that returns from the subject after being emitted onto the subject;
• a height controller coupled with a pair of the light emitter and the light receiver that is connected to the light emitter side-by-side;
• and
• a support member disposed on a side of the height controller and configured to be in contact with a surface skin of the subject;
• wherein the height controller is configured to lift up and down the pair of the light emitter and the light receiver together to adjust a height of the light emitter from support member and a height of the light receiver from the support member to be a same height from the support member, and
• wherein, when the height controller lifts up the pair of the light emitter and the light receiver, the pair of the light emitter and the light receiver are disposed at a level different from the support member.