A sensor-equipped wheel support bearing assembly for rotatably supporting a wheel relative to a vehicle body comprising: an outer member having an inner periphery formed with a plurality of rolling surfaces; an inner member having an outer periphery formed with a plurality of rows of raceways surfaces opposed to the rolling surfaces of the outer member, one of the outer member and the inner member serving as a stationary member; a plurality of rows of rolling elements interposed between the rolling surfaces of the outer member and the rolling surfaces of the inner member; a load-detectable sensor unit (20A, 20B) including a strain generator member and at least two sensors (22A, 22B) mounted on the strain generator member to sense strain in the strain generator member, the strain generator member including at least three fixation contact segments being fixedly in contact with the stationary member; a first load estimator configured to estimate through calculation a load acting on the bearing assembly, based on an average value of output signals of the sensors (22A, 22B); a second load estimator configured to estimate through calculation a load acting on the bearing assembly, based on a combination of the average value and an amplitude value of output signals of the sensors (22A, 22B); characterized by further comprising a summation ratio table that defines a relationship between a wheel rotation speed and a summation ratio (r); and an estimated load provider configured to sum a calculation result from the first load estimator and a calculation result from the second load estimator in the summation ratio (r) that depends on the wheel rotation speed, according to the following equation to output an estimated load value (Lout), Lout = r x LA + 1 - r x LB in which the summation ratio table is adapted to set the summation ratio (r) to 1 when a wheel is not rotating, to set a value equal to or less than 1 in normal speed regime, and to increase in high speed regime. an outer member having an inner periphery formed with a plurality of rolling surfaces; an inner member having an outer periphery formed with a plurality of rows of raceways surfaces opposed to the rolling surfaces of the outer member, one of the outer member and the inner member serving as a stationary member; a plurality of rows of rolling elements interposed between the rolling surfaces of the outer member and the rolling surfaces of the inner member; a load-detectable sensor unit (20A, 20B) including a strain generator member and at least two sensors (22A, 22B) mounted on the strain generator member to sense strain in the strain generator member, the strain generator member including at least three fixation contact segments being fixedly in contact with the stationary member; a first load estimator configured to estimate through calculation a load acting on the bearing assembly, based on an average value of output signals of the sensors (22A, 22B); a second load estimator configured to estimate through calculation a load acting on the bearing assembly, based on a combination of the average value and an amplitude value of output signals of the sensors (22A, 22B); characterized by further comprising a summation ratio table that defines a relationship between a wheel rotation speed and a summation ratio (r); and an estimated load provider configured to sum a calculation result from the first load estimator and a calculation result from the second load estimator in the summation ratio (r) that depends on the wheel rotation speed, according to the following equation to output an estimated load value (Lout), Lout = r x LA + 1 - r x LB in which the summation ratio table is adapted to set the summation ratio (r) to 1 when a wheel is not rotating, to set a value equal to or less than 1 in normal speed regime, and to increase in high speed regime. a summation ratio table that defines a relationship between a wheel rotation speed and a summation ratio (r); and an estimated load provider configured to sum a calculation result from the first load estimator and a calculation result from the second load estimator in the summation ratio (r) that depends on the wheel rotation speed, according to the following equation to output an estimated load value (Lout), Lout = r x LA + 1 - r x LB in which the summation ratio table is adapted to set the summation ratio (r) to 1 when a wheel is not rotating, to set a value equal to or less than 1 in normal speed regime, and to increase in high speed regime.