The invention relates to an immobilization device for locking a furniture part that is movably supported in or on a piece of furniture, particularly a drawer, in a closed end position. The device includes at least one locking unit, which has a receiving element for an engagement element and a blocking mechanism for the releasable fixation of the receiving element in a position that locks the engagement element when the movable furniture part is in the closed end position. The receiving element or the engagement element is disposed on the furniture, and the other element is disposed on the moved furniture part. The locking unit has an overload safety mechanism, which includes at least two parts connected movably to each other.