A device for overcoming height differences between a first lower height level and a second higher height level, in particular when boarding vehicles or entering structures, the device being transferrable from a stowed state into a first folded-out state, into a second folded-out state, and back, by a mechanical folding movement, comprising: - a stowage compartment, comprising a stowage compartment bottom including a front edge; - a folding ramp; and - a one- or multi-piece floor lid, the device being disposable, or disposed, in a region of the second height level, adjoining a floor on the second height level in such a way that the front edge of the stowage compartment bottom is located lower than the second height level, - in the stowed state, the floor lid being located at the second height level, and the folding ramp being stowed beneath the floor lid in the stowage compartment, - the floor lid, in the case of a one-piece floor lid, being pivotably hinged at a side edge of the stowage compartment, and thus being pivotable about a first rotational axis A, which is transverse to the front edge of the stowage compartment bottom, or, in the case of a multi-piece floor lid, multiple pieces of the floor lid being pivotably hinged at a side edge of the stowage compartment, and thus each being pivotable about different first rotational axes, which are transverse to the front edge of the stowage compartment bottom; - the folding ramp being hinged at the front edge of the stowage compartment bottom so as to be pivotable about a second rotational axis B that is parallel to the front edge of the stowage compartment bottom; and - the first folded-out state, in the case of the one-piece floor lid, being adjustable by folding out the floor lid about the first rotational axis A, or, in the case of the multi-piece floor lid, being adjustable by folding out the floor lid about the first rotational axes; - the second folded-out state being adjustable by folding out the folding ramp about the second rotational axis B; and - in the second folded-out state, the folding ramp being placeable onto the first height level, so that the folding ramp and the stowage compartment bottom together form a sloped surface. - a stowage compartment, comprising a stowage compartment bottom including a front edge; - a folding ramp; and - a one- or multi-piece floor lid, - in the stowed state, the floor lid being located at the second height level, and the folding ramp being stowed beneath the floor lid in the stowage compartment, - the floor lid, in the case of a one-piece floor lid, being pivotably hinged at a side edge of the stowage compartment, and thus being pivotable about a first rotational axis A, which is transverse to the front edge of the stowage compartment bottom, or, in the case of a multi-piece floor lid, multiple pieces of the floor lid being pivotably hinged at a side edge of the stowage compartment, and thus each being pivotable about different first rotational axes, which are transverse to the front edge of the stowage compartment bottom; - the folding ramp being hinged at the front edge of the stowage compartment bottom so as to be pivotable about a second rotational axis B that is parallel to the front edge of the stowage compartment bottom; and - the first folded-out state, in the case of the one-piece floor lid, being adjustable by folding out the floor lid about the first rotational axis A, or, in the case of the multi-piece floor lid, being adjustable by folding out the floor lid about the first rotational axes; - the second folded-out state being adjustable by folding out the folding ramp about the second rotational axis B; and - in the second folded-out state, the folding ramp being placeable onto the first height level, so that the folding ramp and the stowage compartment bottom together form a sloped surface.