A blood pressure measurement apparatus which can install cuffs at a tragus that has differences between individuals is provided. Holding member 3 comprises; a shape part 52 to be installed in a space between an auticular concha and an antihelix, a first protrusion 54 extended from said shape part such that said first protrusion is directed towards the ear hole, a second protrusion 55 extended from said shape part such that said second protrusion is nearly right-angled with respect to said first protrusion and said second protrusion steps over the tragus, an integral member 50 having an ear hook part 51 that is extended from said shape part, said ear hook is integrally made with said 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.