According to the present invention, an aircraft brake disk composed of a pressure disk and a rear disk positioned on each end, and a rotating disk and a fixated disk alternately disposed between the pressure disk and the rear disk. A shaft hole where a torque tube of an aircraft brake penetrates are provided to a center portion of the rotating disk, and a drive key groove where a drive key of a wheel of an aircraft is inserted is formed at constant intervals along an outer circumferential surface on the outer circumferential surface of the rotating disk. The shaft hole where the torque tube of the aircraft brake penetrates is provided to the center portion of the fixed disk, and a spline groove where a spline provided to the outer circumferential surface of the torque tube is inserted is formed at constant intervals on an inner circumferential surface of the shaft hole. The rotating disk is denser outside than the center portion, and the fixed disk has the center portion denser than the outside.;COPYRIGHT KIPO 2015
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