An arrangement for guiding belt-shaped ropes of an elevator includes a plurality of belt-shaped ropes; and a rope wheel deck including a frame mounted on a structure of an elevator, a plurality of rope wheels for guiding ropes of the elevator, and plurality of bearings, wherein the rope wheels are cambered and mounted coaxially on the frame via the bearings such that they are rotatable relative to the frame as well as relative to each other, wherein only one belt-shaped rope passes around each of said rope wheels of the rope wheel deck. An elevator implements the arrangement for guiding belt-shaped ropes of an elevator.