A load detection apparatus comprising: a load input portion having a planar input surface into which a load is input, and a curved output surface provided on a side opposite to the input surface; a flexure element including an annular portion including a contacting portion configured to make contact with at least a part of the curved output surface, and a support portion configured to support the annular portion with a gap between the annular portion and a mounting surface on which the support portion is disposed; and a set of sensors disposed on a reverse surface opposite to a surface provided with the contacting portion in the annular portion, each of the sensors being configured as a strain gauge to detect distortion corresponding to the load input into the load input portion, the set of sensors constituting a first sensor group and a second sensor group, the first sensor group comprising four strain gauges (R1, R3, R5, R7) of the set of sensors and the second sensor group comprising four different strain gauges (R2, R4, R6, R8) of the set of sensors; characterized by a set of calculation portions comprising a first calculation portion and a second calculation portion, wherein in each of the calculation portions a Wheatstone bridge circuit including four strain gauges is configured by serially connecting two strain gauges facing each other in the radial direction of the annular portion among four strain gauges constituting each of the first sensor group and the second sensor group, the first calculation portion constituted by two sensors (R1, R3) of the first sensor group and two sensors (R2, R4) of the second sensor group, the second calculation portion constituted by two other sensors (R5, R7) of the first sensor group and two other sensors (R6, R8) of the second sensor group, the set of calculation portions being configured to calculate a set of magnitudes of the load by use of respective detection results obtained by the bridge circuits; and an abnormality determination portion configured to determine whether the set of sensors and the set of calculation portions have no abnormality, by comparing the set of magnitudes of the load with each other. a load input portion having a planar input surface into which a load is input, and a curved output surface provided on a side opposite to the input surface; a flexure element including an annular portion including a contacting portion configured to make contact with at least a part of the curved output surface, and a support portion configured to support the annular portion with a gap between the annular portion and a mounting surface on which the support portion is disposed; and a set of sensors disposed on a reverse surface opposite to a surface provided with the contacting portion in the annular portion, each of the sensors being configured as a strain gauge to detect distortion corresponding to the load input into the load input portion, the set of sensors constituting a first sensor group and a second sensor group, the first sensor group comprising four strain gauges (R1, R3, R5, R7) of the set of sensors and the second sensor group comprising four different strain gauges (R2, R4, R6, R8) of the set of sensors; characterized by a set of calculation portions comprising a first calculation portion and a second calculation portion, wherein in each of the calculation portions a Wheatstone bridge circuit including four strain gauges is configured by serially connecting two strain gauges facing each other in the radial direction of the annular portion among four strain gauges constituting each of the first sensor group and the second sensor group, the first calculation portion constituted by two sensors (R1, R3) of the first sensor group and two sensors (R2, R4) of the second sensor group, the second calculation portion constituted by two other sensors (R5, R7) of the first sensor group and two other sensors (R6, R8) of the second sensor group, the set of calculation portions being configured to calculate a set of magnitudes of the load by use of respective detection results obtained by the bridge circuits; and an abnormality determination portion configured to determine whether the set of sensors and the set of calculation portions have no abnormality, by comparing the set of magnitudes of the load with each other.