A biologic information detecting apparatus comprising: a pair of arms (31, 32) that face each other and are adapted to sandwich a projecting part of an auricle the human body by an arm disposed on one of side face sides of the projecting part and an arm disposed on the other side face side of the projecting part; a spindle connecting the pair of arms (31, 32) at one end of each of the arms (31, 32); a distance varying mechanism provided for the spindle and adjusting an interval between the other ends of the pair of arms (31, 32); a cuff (55, 56) for pressing a living body, which cuff is attached to the other end of at least one of the arms and attached on the side of the arm facing the other arm; a sensor (33, 34) for detecting the biologic information, which sensor is attached to the other end of at least one of the arms (31, 32) and attached to the side of the arm facing the other arm (31, 32); and a bridge adapted to extend across the right and left auricle and to connect the pair of arms (31,32) attached to one of the right and left auricles, and the auricle to which the pair of arms is not attached; and wherein the biologic information is a blood pressure, characterised in that the projecting part is a tragus; and the cuff (55, 56) is disposed on the inside of an arch- or bowl-shaped front end part of the arm to which the cuff is attached, such that the cuff is configured to come in contact with the surface of the tragus and apply pressure to the tragus in a state where air is supplied to the cuff; and, in a state where the air is exhausted from the cuff, the cuff surface is not in contact with the surface of the tragus, and the biologic information detecting apparatus is configured to be fixed to the surface position of the tragus by the front end part which is around the cuff. a pair of arms (31, 32) that face each other and are adapted to sandwich a projecting part of an auricle the human body by an arm disposed on one of side face sides of the projecting part and an arm disposed on the other side face side of the projecting part; a spindle connecting the pair of arms (31, 32) at one end of each of the arms (31, 32); a distance varying mechanism provided for the spindle and adjusting an interval between the other ends of the pair of arms (31, 32); a cuff (55, 56) for pressing a living body, which cuff is attached to the other end of at least one of the arms and attached on the side of the arm facing the other arm; a sensor (33, 34) for detecting the biologic information, which sensor is attached to the other end of at least one of the arms (31, 32) and attached to the side of the arm facing the other arm (31, 32); and a bridge adapted to extend across the right and left auricle and to connect the pair of arms (31,32) attached to one of the right and left auricles, and the auricle to which the pair of arms is not attached; and wherein the biologic information is a blood pressure, characterised in that the projecting part is a tragus; and the cuff (55, 56) is disposed on the inside of an arch- or bowl-shaped front end part of the arm to which the cuff is attached, such that the cuff is configured to come in contact with the surface of the tragus and apply pressure to the tragus in a state where air is supplied to the cuff; and, in a state where the air is exhausted from the cuff, the cuff surface is not in contact with the surface of the tragus, and the biologic information detecting apparatus is configured to be fixed to the surface position of the tragus by the front end part which is around the cuff.