In the present invention, the sun gear (11), carrier (12), and ring gear (13) of a first planetary gear mechanism (10) are joined to the ring gear (23) of a second planetary gear mechanism (20), the carrier (42) of a fourth planetary gear mechanism, and the ring gear (33) and carrier (32) of a third planetary gear mechanism (30); a carrier (22) is joined to a ring gear (43); an input shaft (3) is connected to the carrier (12), a sun gear (21), and a sun gear (41) with clutches (C1, C2, C3) therebetween; brakes (B1, B2, B3) are connected to the carrier (22), the sun gear (21), and a sun gear (31); and an output gear (4) is connected to the ring gear (13). As a result it is possible to configure an automatic transmission device that can shift to a forward first gear through a forward ninth gear and a reverse gear.