An automatic transmission (1) includes, in a transmission case (2), an input shaft (3), first to third planetary gear sets (PL1-PL3) of a single pinion type, a fourth planetary gear set (PL4) of a double pinion type, five frictional engagement elements (CL1, CL2, and B1-B3), and outputs (7, 8). The outputs (7, 8) are always engaged with a fourth ring gear (R4).