A dishwasher comprising: a washing tub having therein a space for receiving objects to be washed; a pair of main arms (300a, 300b) rotatably provided in the washing tub and extending in one direction for spraying wash water to the objects; a pair of auxiliary arm connectors (330a, 330b) integrally from the main arms (300a, 300b) and extending in the other direction to form a predetermined angle with respect to the main arms (300a, 300b); a pair of auxiliary arms (400a, 400b) rotatably coupled at the auxiliary arm connector (330a, 330b) and configured to rotate about the auxiliary arm connectors (330a, 330b) as an axis for spraying wash water to the objects; a stationary gear unit fixed in the washing tub for rotatably supporting the main arms (300a, 300b), the stationary gear unit being provided at an outer circumferential surface thereof with gear teeth; an eccentric gear unit rotatably mounted at the main arms (300a, 300b) so as to be engaged with the stationary gear unit, the eccentric gear unit being configured to be rotated by rotation of the main arms (300a, 300b); and a link member movably supported by the main arms (300a, 300b) for transferring rotational force of the eccentric gear unit to the auxiliary arms (400a, 400b) using elastic force to rotate the auxiliary arms (400a, 400b), wherein the link member comprises: a rim-shaped body; a main link (920a, 920b) extending from the rim-shaped body along the main arms (300a, 300b) so as to be connected to the main arms (300a, 300b); an auxiliary link (950a, 950b) extending along the auxiliary arms (400a, 400b) in a direction intersecting the main link (920a, 920b) so as to be connected to the auxiliary arms (400a, 400b); and an elastic shock-absorbing unit (960a, 960b) provided between the rim-shaped body and the auxiliary link (950a, 950b) for generating elastic force, and wherein the elastic shock-absorbing unit (960a, 960b) comprises: a first extension link extending from the rim-shaped body to an outside of the auxiliary link (950a, 950b); a second extension link extending from the outside of the auxiliary link (950a, 950b) to the rim-shaped body; and an elastic link connecting the first extension link with the second extension link; and a reinforcement part formed between the first extension link, the second extension link, and the elastic link. a washing tub having therein a space for receiving objects to be washed; a pair of main arms (300a, 300b) rotatably provided in the washing tub and extending in one direction for spraying wash water to the objects; a pair of auxiliary arm connectors (330a, 330b) integrally from the main arms (300a, 300b) and extending in the other direction to form a predetermined angle with respect to the main arms (300a, 300b); a pair of auxiliary arms (400a, 400b) rotatably coupled at the auxiliary arm connector (330a, 330b) and configured to rotate about the auxiliary arm connectors (330a, 330b) as an axis for spraying wash water to the objects; a stationary gear unit fixed in the washing tub for rotatably supporting the main arms (300a, 300b), the stationary gear unit being provided at an outer circumferential surface thereof with gear teeth; an eccentric gear unit rotatably mounted at the main arms (300a, 300b) so as to be engaged with the stationary gear unit, the eccentric gear unit being configured to be rotated by rotation of the main arms (300a, 300b); and a link member movably supported by the main arms (300a, 300b) for transferring rotational force of the eccentric gear unit to the auxiliary arms (400a, 400b) using elastic force to rotate the auxiliary arms (400a, 400b), wherein the link member comprises: a rim-shaped body; a main link (920a, 920b) extending from the rim-shaped body along the main arms (300a, 300b) so as to be connected to the main arms (300a, 300b); an auxiliary link (950a, 950b) extending along the auxiliary arms (400a, 400b) in a direction intersecting the main link (920a, 920b) so as to be connected to the auxiliary arms (400a, 400b); and an elastic shock-absorbing unit (960a, 960b) provided between the rim-shaped body and the auxiliary link (950a, 950b) for generating elastic force, and a rim-shaped body; a main link (920a, 920b) extending from the rim-shaped body along the main arms (300a, 300b) so as to be connected to the main arms (300a, 300b); an auxiliary link (950a, 950b) extending along the auxiliary arms (400a, 400b) in a direction intersecting the main link (920a, 920b) so as to be connected to the auxiliary arms (400a, 400b); and an elastic shock-absorbing unit (960a, 960b) provided between the rim-shaped body and the auxiliary link (950a, 950b) for generating elastic force, and wherein the elastic shock-absorbing unit (960a, 960b) comprises: a first extension link extending from the rim-shaped body to an outside of the auxiliary link (950a, 950b); a second extension link extending from the outside of the auxiliary link (950a, 950b) to the rim-shaped body; and an elastic link connecting the first extension link with the second extension link; and a first extension link extending from the rim-shaped body to an outside of the auxiliary link (950a, 950b); a second extension link extending from the outside of the auxiliary link (950a, 950b) to the rim-shaped body; and an elastic link connecting the first extension link with the second extension link; and a reinforcement part formed between the first extension link, the second extension link, and the elastic link.