To obtain a speed change ratio of six advance speeds or seven advance speeds using planetary gear sets in three trains to shorten the length in the axial direction of the gear trains.

This multi-stage gear shift planetary gear train is composed of a first planetary gear set provided with a first input member, a first output member, and a first reaction force member, a second planetary gear set and a third planetary gear set in which rotary members in a part are mutually connected and which are provided with a second input member, a second output member, a second reaction force member, and a third reaction force member. An input shaft is connected with the first input member and can be connected with the third reaction force member. An output shaft is connected with the second output member. The first output member is connected with the second input member. The first reaction force member, the second reaction force member, and the third reaction force member can be fixed to a case. The first planetary gear set can rotate integrally by a clutch. The first reaction force member and the third reaction force member are made mutually connectable.