An elliptical exercise machine (100) includes two swing rods (2) connected pivotally to a base (1), a flywheel (3), two supporting rods (4) connected pivotally between the flywheel (3) and the swing rods (2), two pedal rods (5) slidable respectively on the supporting rods (4), and a motion transmitting device (6). The device (6) includes a fixed member (61) fixed on the base (1), a rotatable member (62) locked releaseably on the fixed member (61) at a selected angular position, two cranks (63) connected pivotally to the rotatable member (62), and two links (64) each having a first pivot portion (641) connected pivotally to the corresponding pedal rod (5), a second pivot portion (642) connected pivotally to the corresponding swing rod (2), and a third pivot portion (643) connected pivotally to the corresponding crank (63) . The links (64) are driven by the cranks (63) to move the pedal rods (5) forwardly and rearwardly on the supporting rods (4), respectively.