PROBLEM TO BE SOLVED: To provide a biological information detection device capable of being easily and stably attached, and preferably detecting biological information.SOLUTION: A biological information detection device 100 comprises: a detection part for detecting biological information which a living body has holding parts 115, 125, 135, 145 for holding an ear or earlobe of the living body to hold the detection part to a position where the detection part can detect the biological information a cable 180 connected to the detection part, and capable of curving along the ear capsule of the living body and a retain part disposed on the holding parts, and retaining the cable so that an angle of the cable can be adjusted and the cable can slide. Therefore, the biological information detection device can be easily and stably attached to the living body, and can extremely preferably detect the biological information.SELECTED DRAWING: Figure 2
