A preload inspection method for a bearing device for a vehicle wheel , wherein the bearing device for a vehicle wheel includes: an outer member having multiple-row outer raceway surfaces ; an inner member that is configured with a hub ring and an inner ring press-fitted into a small-diameter step portion of the hub ring and has multiple-row inner raceway surfaces ; and multiple-row rolling bodies each interposed between the raceway surfaces of the outer member and the inner member , the preload inspection method for the bearing device for a vehicle wheel comprising: a power calculating step (S5) of relatively rotating the outer member or the inner member to calculate a power (P); a preload value calculating step (S6) of calculating a preload value (F2) on the basis of the power (P) calculated in the power calculating step (S5); and an acceptance determining step (S7) of determining acceptance on the basis of whether or not the preload value (F2) calculated in the preload value calculating step (S6) falls within an allowable range (R) characterized in that the power calculating step (S5) includes calculating powers (P1, P2) at a plurality of rotation speeds, and the preload value calculating step (S6) includes calculating a preload value (F2) on the basis of a difference (ΔP) between two of the powers (P1, P2). an outer member having multiple-row outer raceway surfaces ; an inner member that is configured with a hub ring and an inner ring press-fitted into a small-diameter step portion of the hub ring and has multiple-row inner raceway surfaces ; and multiple-row rolling bodies each interposed between the raceway surfaces of the outer member and the inner member , the preload inspection method for the bearing device for a vehicle wheel comprising: a power calculating step (S5) of relatively rotating the outer member or the inner member to calculate a power (P); a preload value calculating step (S6) of calculating a preload value (F2) on the basis of the power (P) calculated in the power calculating step (S5); and an acceptance determining step (S7) of determining acceptance on the basis of whether or not the preload value (F2) calculated in the preload value calculating step (S6) falls within an allowable range (R) characterized in that the power calculating step (S5) includes calculating powers (P1, P2) at a plurality of rotation speeds, and the preload value calculating step (S6) includes calculating a preload value (F2) on the basis of a difference (ΔP) between two of the powers (P1, P2). a power calculating step (S5) of relatively rotating the outer member or the inner member to calculate a power (P); a preload value calculating step (S6) of calculating a preload value (F2) on the basis of the power (P) calculated in the power calculating step (S5); and an acceptance determining step (S7) of determining acceptance on the basis of whether or not the preload value (F2) calculated in the preload value calculating step (S6) falls within an allowable range (R) the power calculating step (S5) includes calculating powers (P1, P2) at a plurality of rotation speeds, and the preload value calculating step (S6) includes calculating a preload value (F2) on the basis of a difference (ΔP) between two of the powers (P1, P2). <EOS>