A synchronization device for moving a movable furniture part, including: - a first actuating device and at least one second actuating device which are provided for moving the movable furniture part in the mounted condition on an item of furniture, wherein the first actuating device and the second actuating device each have a pivotable portion, - a synchronization rod for transmitting a synchronous movement of the pivotable portions of the at least two actuating devices (3a, 3b), - at least one fastening device by which the synchronization rod can be releasably connected to at least one of the pivotable portions of the first and second actuating device (3a, 3b), wherein the at least one pivotable portion has a guide for fastening and receiving the synchronization rod, and wherein the fastening device includes a releasable locking device which, in a locking condition, prevents a connection of the synchronization rod to the at least one pivotable portion, wherein the synchronization rod can be inserted within a, preferably U-shaped, guide of one of the actuating devices (3a, 3b) and can be clamped therein, - wherein the locking device, without prior actuation by an operator, is in the locking condition, wherein the locking device includes a handle element to be actuated by a person and at least one arresting element which can be moved by the handle element, the arresting element can be released and locked relative to the guide of the at least one pivotable portion and prevents, in the locking condition, a connection of the synchronization rod to the guide of the pivotable portion, and can be moved into a release condition by an actuation of the handle element, so that the synchronization rod, after prepositioning, can be locked relative to the guide of the pivotable portion of the actuating device (3a, 3b), characterized in that - the arresting element is substantially wedge-shaped and is movably-mounted relative to the synchronization rod, wherein the arresting element is displaceably mounted in a longitudinal direction of the synchronization rod, - the arresting element can be acted upon by a spring device in a direction of the locking condition or is permanently acted upon by the spring device in the direction of the locking condition, and - the handle element is configured as a slider, wherein the arresting element can be moved into the release condition by an actuation of the slider. - a first actuating device and at least one second actuating device which are provided for moving the movable furniture part in the mounted condition on an item of furniture, wherein the first actuating device and the second actuating device each have a pivotable portion, - a synchronization rod for transmitting a synchronous movement of the pivotable portions of the at least two actuating devices (3a, 3b), - at least one fastening device by which the synchronization rod can be releasably connected to at least one of the pivotable portions of the first and second actuating device (3a, 3b), wherein the at least one pivotable portion has a guide for fastening and receiving the synchronization rod, and wherein the fastening device includes a releasable locking device which, in a locking condition, prevents a connection of the synchronization rod to the at least one pivotable portion, wherein the synchronization rod can be inserted within a, preferably U-shaped, guide of one of the actuating devices (3a, 3b) and can be clamped therein, - wherein the locking device, without prior actuation by an operator, is in the locking condition, wherein the locking device includes a handle element to be actuated by a person and at least one arresting element which can be moved by the handle element, the arresting element can be released and locked relative to the guide of the at least one pivotable portion and prevents, in the locking condition, a connection of the synchronization rod to the guide of the pivotable portion, and can be moved into a release condition by an actuation of the handle element, so that the synchronization rod, after prepositioning, can be locked relative to the guide of the pivotable portion of the actuating device (3a, 3b), - the arresting element is substantially wedge-shaped and is movably-mounted relative to the synchronization rod, wherein the arresting element is displaceably mounted in a longitudinal direction of the synchronization rod, - the arresting element can be acted upon by a spring device in a direction of the locking condition or is permanently acted upon by the spring device in the direction of the locking condition, and - the handle element is configured as a slider, wherein the arresting element can be moved into the release condition by an actuation of the slider.