A drive device for a movable furniture part includes a lockable ejection device. The ejection device has a force-actuated ejection lever for ejecting the movable furniture part along an ejection section from a closed position into an open position. In the closed position, the ejection lever bears against a locking element in a locking position. By moving the movable furniture part into a pressed-over position situated behind the closed position in the closing direction, the ejection device can be unlocked in that the locking element opens up a first path in the ejection section for the ejection lever. By pulling on the movable furniture part, the ejection device can be brought from the closed position into a pull-unlocking position in front of the closed position in the opening direction so that the ejection lever passes into the ejection section over a second path space apart from the first path.