This blade vibration monitoring device comprises: a rotary machine that is provided with a rotation shaft that extends along an axis and a plurality of moving blades that have moving blade bodies that extend radially from the rotation shaft outward in the radial direction and shrouds that are provided at the tips of the moving blade bodies and contact each other in the circumferential direction; and sensors that are provided radially outside the shrouds so as to face the shrouds and that detect changes in the outer circumferential surfaces of the shrouds. The outer circumferential surface of each shroud has first surfaces and a second surface which is disposed so as to be interposed between the first surfaces at both sides in the circumferential direction and for which a detection signal generated by the sensors is different from that for the first surfaces.
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