A sensor equipped wheel support bearing apparatus comprising: - a bearing assembly including 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 held in a face to face relation with the rolling surfaces of the outer member, a plurality of rows of rolling elements interposed between the respective rolling surfaces (3, 4) in the outer member and the inner member; - at least one or more sensor units to detect a load acting on the bearing assembly, - a signal processor to process an output signal from each sensor unit to generate a signal vector, and - a load calculator to calculate a load acting on the vehicle wheel from the signal vector; wherein: - the load calculator has a function to determine the ON or OFF state of a brake as a predetermined state in a vehicle that affects a result of calculation of the load, and to perform two types of calculations that correspond respectively to the ON or OFF state of a brake and, - the load calculator is configured to calculate at least a load (Fx) which acts in a forward and rearward direction of the wheel support bearing assembly and to determine the ON or OFF state of the brake by utilizing the calculation results in the form of the load (Fx) that acts in the forward and rearward direction; the sensor equipped wheel support apparatus characterized in that - the load calculator is configured to simultaneously perform both of the two types of calculations and to select one of the results of the two types of calculations which is a proper result to be outputted, depending on the ON or OFF state of the brake. - a bearing assembly including 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 held in a face to face relation with the rolling surfaces of the outer member, a plurality of rows of rolling elements interposed between the respective rolling surfaces (3, 4) in the outer member and the inner member; - at least one or more sensor units to detect a load acting on the bearing assembly, - a signal processor to process an output signal from each sensor unit to generate a signal vector, and - a load calculator to calculate a load acting on the vehicle wheel from the signal vector; wherein: - the load calculator has a function to determine the ON or OFF state of a brake as a predetermined state in a vehicle that affects a result of calculation of the load, and to perform two types of calculations that correspond respectively to the ON or OFF state of a brake and, - the load calculator is configured to calculate at least a load (Fx) which acts in a forward and rearward direction of the wheel support bearing assembly and to determine the ON or OFF state of the brake by utilizing the calculation results in the form of the load (Fx) that acts in the forward and rearward direction; the sensor equipped wheel support apparatus characterized in that - the load calculator is configured to simultaneously perform both of the two types of calculations and to select one of the results of the two types of calculations which is a proper result to be outputted, depending on the ON or OFF state of the brake. - the load calculator has a function to determine the ON or OFF state of a brake as a predetermined state in a vehicle that affects a result of calculation of the load, and to perform two types of calculations that correspond respectively to the ON or OFF state of a brake and, - the load calculator is configured to calculate at least a load (Fx) which acts in a forward and rearward direction of the wheel support bearing assembly and to determine the ON or OFF state of the brake by utilizing the calculation results in the form of the load (Fx) that acts in the forward and rearward direction; the sensor equipped wheel support apparatus characterized in that - the load calculator is configured to simultaneously perform both of the two types of calculations and to select one of the results of the two types of calculations which is a proper result to be outputted, depending on the ON or OFF state of the brake.