A pulse wave measurement electrode unit (200) includes electrodes (41 to 46) including a pair of current applying electrodes and a first pair of voltage measuring electrodes； a support member (210) that supports the electrodes on a first main surface (211) that faces a body surface of a measurement subject in a case that the pulse wave measurement electrode unit is attached on the measurement subject； and a fluid bag (24) configured to expand and contract and configured to expand upon measurement to press the electrodes (41 to 46) against the body surface of the measurement subject. The support member (210) includes a length direction (L) corresponding to a circumferential direction of the device in an attached state to the measurement subject and a width direction (W) orthogonal to the length direction (L) and a thickness direction. The electrodes (41 to 46) are arranged side by side in the width direction (W). Low rigidity portions are provided between adjacent electrodes, the low rigidity portions having a lower rigidity than a rigidity of portions that overlap the electrodes in the thickness direction.
