a guide main body part;

an upper support roller part coupled to one side of the guide main body part to be rotatable with respect to a central axis;

a lower support roller part coupled to one side of the guide main body part to be rotatable with respect to a central axis;

a guide rail part extendedly formed along a sliding direction with one side inserted into a space between the upper support roller part and the lower support roller part; and

a rack roller part having one side inserted into the guide rail part and the other side coupled to one surface inside the main body of the dishwasher or coupled to a sliding basket,

wherein the guide rail part comprises an upper guide part having a shape corresponding to a circumference of the upper support roller part and a lower guide part having a shape corresponding to a circumference of the lower support roller part, and

a width L2 of the lower guide part is greater than a width L1 of the upper guide part.