A blood pressure measurement apparatus which can install cuffs at a tragus that has differences includes a holding member 3 having a shape part 52 to be installed in a space between an auricular concha and an antihelix, a first protrusion 54 extended from the shape part such that the first protrusion is directed towards the ear hole, a second protrusion 55 extended from the shape part such that the second protrusion is nearly right-angled with respect to the first protrusion and the second protrusion steps over the tragus, an integral member 50 having an ear hook part 51 that is extended from the shape part, the ear hook is integrally made with the integral member or made as an independent member, inner cuff 6 is supported at the end portion of the first protrusion, support member 15 is attached at the end portion of the second protrusion, cuffs 6,7 are attached to the support member through a clamping width adjustment part 11 that makes a clamping width adjustment against the tragus possible.