A living body index measurement apparatus for measuring a living body index of a human subject and for displaying information on the measured living body index, comprising: a base plate unit having a platform on which the human subject stands while measurement is taken; a calculation processing circuit that is built in the base plate unit and for calculating a living body index of the human subject based on a measurement value obtained from the human subject; a pillar that stands upright from the base plate unit, with a bottom end of the pillar being connected detachably to the base plate unit; a display unit that is detachably mounted at a top end of the pillar and for displaying information including the living body index, the display unit having a processor; and a cable for connecting the display unit and the base plate unit, characterised in that: the pillar has a back side in which a groove is formed, the groove extending in the vertical direction, the display unit is received in a recess at a top end of the pillar in a detachable manner, and includes a first interface board having a first connector connected to the processor, a second interface board is built in the base plate unit, the second interface board having a second connector connected to the calculation processing circuit in the base plate unit, the cable has an end having a third connector detachably connected to the first connector of the first interface board in the display unit, the cable having another end having a fourth connector detachably connected to the second connector of the second interface board in the base plate unit, the cable extending along the external surface of the pillar and accommodated in the groove of the pillar. a base plate unit having a platform on which the human subject stands while measurement is taken; a calculation processing circuit that is built in the base plate unit and for calculating a living body index of the human subject based on a measurement value obtained from the human subject; a pillar that stands upright from the base plate unit, with a bottom end of the pillar being connected detachably to the base plate unit; a display unit that is detachably mounted at a top end of the pillar and for displaying information including the living body index, the display unit having a processor; and a cable for connecting the display unit and the base plate unit, characterised in that: the pillar has a back side in which a groove is formed, the groove extending in the vertical direction, the display unit is received in a recess at a top end of the pillar in a detachable manner, and includes a first interface board having a first connector connected to the processor, a second interface board is built in the base plate unit, the second interface board having a second connector connected to the calculation processing circuit in the base plate unit, the cable has an end having a third connector detachably connected to the first connector of the first interface board in the display unit, the cable having another end having a fourth connector detachably connected to the second connector of the second interface board in the base plate unit, the cable extending along the external surface of the pillar and accommodated in the groove of the pillar. the pillar has a back side in which a groove is formed, the groove extending in the vertical direction, the display unit is received in a recess at a top end of the pillar in a detachable manner, and includes a first interface board having a first connector connected to the processor, a second interface board is built in the base plate unit, the second interface board having a second connector connected to the calculation processing circuit in the base plate unit, the cable has an end having a third connector detachably connected to the first connector of the first interface board in the display unit, the cable having another end having a fourth connector detachably connected to the second connector of the second interface board in the base plate unit, the cable extending along the external surface of the pillar and accommodated in the groove of the pillar.