A drive device for a movable furniture part, comprising - an ejection force storage member which can be tensioned, - an ejection element for carrying out an ejection movement of the movable furniture part from a closed position into an open position, wherein the ejection movement can be initiated by an over-pressing movement (Ü) of the movable furniture part into an over-pressing position (ÜS) which is behind the closed position, wherein the ejection element is force-actuated by the ejection force storage member and - a tensioning device for tensioning the ejection force storage member with energy which can be released during the ejection movement, wherein the movable furniture part can travel a furniture part tensioning distance (M S) during tensioning of the ejection force storage member by the tensioning device, in which tensioning distance (M S) the ejection force storage member is movable from a relaxed or partly tensioned position (E 0-50) along a force storage tensioning distance (K S) into a tensioned position (E 100), and wherein a furniture part ejection distance (M A) can be travelled by the movable furniture part during the ejection of the movable furniture part by the ejection element, in which ejection distance (M A) the ejection force storage member is movable from said tensioned position (E 100) along a force storage relaxing distance (K E) into the relaxed or partly tensioned position (E 0-50), characterized in that the furniture part ejection distance (M A) is larger than the furniture part tensioning distance (M S), wherein the furniture part tensioning distance (M S) for the most part corresponds to a furniture part movement distance during the over-pressing movement (Ü), wherein it is provided that - the drive device comprises a transmission device arranged between a tensioning element of the tensioning device and the ejection element, wherein the transmission ratio between the tensioning element and the ejection force storage member during tensioning of the ejection force storage member is different than between the ejection element and the ejection force storage member during the ejection of the movable furniture part. - an ejection force storage member which can be tensioned, - an ejection element for carrying out an ejection movement of the movable furniture part from a closed position into an open position, wherein the ejection movement can be initiated by an over-pressing movement (Ü) of the movable furniture part into an over-pressing position (ÜS) which is behind the closed position, wherein the ejection element is force-actuated by the ejection force storage member and - a tensioning device for tensioning the ejection force storage member with energy which can be released during the ejection movement, - the drive device comprises a transmission device arranged between a tensioning element of the tensioning device and the ejection element, wherein the transmission ratio between the tensioning element and the ejection force storage member during tensioning of the ejection force storage member is different than between the ejection element and the ejection force storage member during the ejection of the movable furniture part.