Abstract: A laterally disposed winding device for music boxes including an extended shaft, a driving gear, an idle gear, a crown gear, a securing frame and linking-up assembly. By turning a handle of the extended shaft, the driving gear brings the crown gear to rotate in a same direction via the idle gear, thereby tightening a spiral spring of the music box. When the spiral spring is released and a revolving axle thereof turns, the crown gear brings a cam on the idle gear to rotate so that a driven element and a reciprocating mechanism of the linking-up assembly respectively bring one of the figures on the music box to move up and down and the other to move backwards and forwards.