The invention relates to a depalletizing device comprising a carriage as well as a friction roller attached to the carriage, which friction roller is rotatable about a horizontal rotation axis and is coupled to a rotational drive in order to rotate. The carriage can be moved to and fro in a direction at right angles to the rotation axis of the friction roller in order to push the friction roller against a side of an object on the pallet in such a manner that the friction roller exerts an upward friction force on the object as a result of which the object is raised on that side, and in order for the friction roller to pass underneath said object after the latter has been raised. The depalletizing device comprises drive means with variable driving power in order to drive the carriage. The drive means comprise detection means. The drive means are designed such that, when the carriage moves, it is driven with a power of not more than a base value and that, when the friction roller engages on the side of the object, the driving power is increased from that power until the detection means detect that the object has been raised. The power is then immediately reduced to the power of not more than the said base value when the detection means detect that the object has been raised sufficiently high.