An apparatus for loading a disk in a disk player. The apparatus includes a main chassis on which a transferring roller for transferring the disk to the inside of the player is mounted; a power transferring unit for transferring power of a driving motor to the transferring roller; and a slider mounted on the main chassis, for being moved back and forth along a loading direction of the disk, and which is selectively connected to the power transferring unit, for being driven back and forth. The apparatus further includes an interworking mechanism for guiding the disk into a chucking position, and which is moved and pushed by the disk going forward upon entrance of the disk, to move the slider to connect with the power transferring unit; and a sub-chassis for cooperating with the slider to move back and forth in a direction perpendicular to the loading direction, and to cooperate with the interworking mechanism to isolate the interworking mechanism from the disk positioned on the chucking position. The apparatus further includes a locking lever that cooperates with the disk moving in the loading and unloading directions or with the sub-chassis, to selectively lock or unlock a movement of the interworking mechanism; and an impulse alleviating device for alleviating an impulse generated when the interworking mechanism is restored to an original position