In a running device for a model (6) comprising a pair of motors (7), a pair of left and right wheels (8) which are independently driven by the pair of motors (7), and a control device (20) which controls operations of the pair of motors (7) based on instructions concerning speed and direction, the control device (20) controls the pair of motors (7) such that the pair of motors (7) are alternately rotated in an instructed direction when the instructed speed (Vm) is in a low speed range (L, M), and the pair of motors (7) are rotated in the instructed direction simultaneously when the instructed speed is in a high speed range (H) which is higher than the low speed range.