To provide a speed change control system capable of carrying out an entire speed change operation of a transmission in which speed change operation of a first and a second speed change units are carried out simultaneously in directions opposite to each other, without deteriorating shocks even in case a speed change operation of one of the speed change units is restricted.For this purpose, there is provided a speed change control system for an automatic transmission, which has a first and a second speed change units, and in which a speed change ratio of the second speed change unit is changed in a direction opposite to a changing direction of a speed change ratio of the first speed change unit when changing the speed change ratio of the first speed change unit, comprising: a speed changing rate setting means for setting a speed changing rate of the second speed change unit in accordance with a progression of a speed change operation of the first speed change unit.