Device for simulating seatbelt slack and/or for simulating seatbelt forces

A device for simulating a belt slack and/or for simulating belt forces, comprising

• a guide (12) for a seatbelt (20) which includes static guide elements (14) and a movable deflection element (16) which is adjacent to two static guide elements (14) and which is adjustable relative to the latter from an initial state via an intermediate state to a final state, and
• at least one inertial mass (18),
• wherein the guideway (17) for a seatbelt (20) predetermined by the deflection element (16) and the adjacent guide elements (14) is V-shaped in the initial state and the deflection element (16) and the inertial mass (18) do not interact, in the intermediate state is designed to be less V-shaped and the deflection element (16) and the inertial mass (18) interact so that the mass inertia of the inertial mass (18) counteracts a movement of the deflection element (16) toward the final state, and the predetermined guideway (17) is at least approximately linear in the final state.