Access ladder apparatus for scaffolds, in particular for ensuring the possibility of ascending/descending in the area of passage between scaffold levels, having - two ladder stiles disposed parallel to and at a distance from one another, - ladder rungs connected parallel to and at a distance from one another between the ladder stiles in the longitudinal direction, - respectively one suspension hook device disposed in the upper end region of the ladder stiles having a hook unit, by means of which a scaffold building profile unit can be grasped in some regions, -- wherein the suspension hook device exhibits a lateral opening, to which an internal contour adjoins, -- the internal contour, starting from the free end region of the tip of the hook unit, exhibits towards the inside a first, linear internal edge contour region, a second linear internal edge contour region perpendicularly adjoining the first internal edge contour region, a third linear internal edge contour region and a fourth internal edge contour region adjoining the third internal edge contour region and a fifth internal edge contour region, - characterized in that - the third internal edge contour region adjoins the second internal edge contour region and is disposed offset to the outside with respect to the second internal edge contour region, so that the plane of the third internal edge contour region exhibits an offset to the outside with respect to the plane of the second internal edge contour region, - the fourth internal edge contour region is disposed substantially in the longitudinal direction of the suspension hook device and - the fifth internal edge contour region is disposed substantially in the transverse direction of the suspension hook device. - two ladder stiles disposed parallel to and at a distance from one another, - ladder rungs connected parallel to and at a distance from one another between the ladder stiles in the longitudinal direction, - respectively one suspension hook device disposed in the upper end region of the ladder stiles having a hook unit, by means of which a scaffold building profile unit can be grasped in some regions, -- wherein the suspension hook device exhibits a lateral opening, to which an internal contour adjoins, -- the internal contour, starting from the free end region of the tip of the hook unit, exhibits towards the inside a first, linear internal edge contour region, a second linear internal edge contour region perpendicularly adjoining the first internal edge contour region, a third linear internal edge contour region and a fourth internal edge contour region adjoining the third internal edge contour region and a fifth internal edge contour region, -- wherein the suspension hook device exhibits a lateral opening, to which an internal contour adjoins, -- the internal contour, starting from the free end region of the tip of the hook unit, exhibits towards the inside a first, linear internal edge contour region, a second linear internal edge contour region perpendicularly adjoining the first internal edge contour region, a third linear internal edge contour region and a fourth internal edge contour region adjoining the third internal edge contour region and a fifth internal edge contour region, - characterized in that - the third internal edge contour region adjoins the second internal edge contour region and is disposed offset to the outside with respect to the second internal edge contour region, so that the plane of the third internal edge contour region exhibits an offset to the outside with respect to the plane of the second internal edge contour region, - the fourth internal edge contour region is disposed substantially in the longitudinal direction of the suspension hook device and - the fifth internal edge contour region is disposed substantially in the transverse direction of the suspension hook device.