A bio-information detecting apparatus includes: a band member curved in a C-shape, and attached around a neck part of an examinee from a back side of the neck part; and a pair of electrodes for cardiac potential measurement disposed at positions on the band member that come into contact with right and left skin surfaces of the neck part, and in the pair of electrodes, a position of the electrode on the right is located relatively more frontward than a position of the electrode on the left. The bio-information detecting apparatus further includes a substrate to optically measure a blood oxygen saturation for pulse measurement at a position on the band member that comes into contact with the neck part of the examinee, and a pressing force of the substrate against the skin surface of the neck part is 0.96 to 1.21 [N/cm2].