A sensor-equipped wheel support bearing assembly comprising: an outer member having an inner periphery formed with a plurality of rolling surfaces, an inner member having an outer periphery formed with rolling surfaces opposed to the rolling surfaces of the outer member, a plurality of rows of rolling elements interposed between those opposed rolling surfaces in the outer member and the inner member, a vehicle body fitting flange provided in an outer periphery of one of the outer member and the inner member that serves as a stationary member, adapted to be connected with a knuckle and having a plurality of bolt holes defined at respective circumferential locations thereof and also having projecting pieces, provided in the circumferential locations at which the bolt holes are defined, protruding radially outwardly from the remaining portion of such flange; and a sensor unit including a strain generating member, having at least two contact fixing segments adapted to be fixed to an outer diametric surface of the stationary member in contact therewith and at least one cutout portion, and a sensor element for detecting a strain induced in a portion of the strain generating member in a periphery of the cutout portion, wherein the sensor unit is so arranged that the at least two contact fixing segments occupy respective positions that are of a same size in an axial direction relative to the outer diametric surface of the stationary member; and the respective positions of the at least two contact fixing segments are spaced an angle from each other in a direction about an axis of the stationary member and the angle between the contact fixing segments provided at respective end portions of the sensor unit is chosen to be equal to or smaller than half an angle between the neighboring projecting pieces of the stationary member; the sensor-equipped wheel support bearing assembly characterized in that the angle defined by two contiguous contact fixing segments of the at least two contact fixing segments is chosen to be half an angle defined by two consecutive rolling elements. an outer member having an inner periphery formed with a plurality of rolling surfaces, an inner member having an outer periphery formed with rolling surfaces opposed to the rolling surfaces of the outer member, a plurality of rows of rolling elements interposed between those opposed rolling surfaces in the outer member and the inner member, a vehicle body fitting flange provided in an outer periphery of one of the outer member and the inner member that serves as a stationary member, adapted to be connected with a knuckle and having a plurality of bolt holes defined at respective circumferential locations thereof and also having projecting pieces, provided in the circumferential locations at which the bolt holes are defined, protruding radially outwardly from the remaining portion of such flange; and a sensor unit including a strain generating member, having at least two contact fixing segments adapted to be fixed to an outer diametric surface of the stationary member in contact therewith and at least one cutout portion, and a sensor element for detecting a strain induced in a portion of the strain generating member in a periphery of the cutout portion, wherein the sensor unit is so arranged that the at least two contact fixing segments occupy respective positions that are of a same size in an axial direction relative to the outer diametric surface of the stationary member; and the respective positions of the at least two contact fixing segments are spaced an angle from each other in a direction about an axis of the stationary member and the angle between the contact fixing segments provided at respective end portions of the sensor unit is chosen to be equal to or smaller than half an angle between the neighboring projecting pieces of the stationary member; the sensor-equipped wheel support bearing assembly characterized in that