A power transmission apparatus for a working vehicle has substantially symmetrically disposed first and second transaxles (2), each of which supports a single axle (2), and a working apparatus driving power take-off device (P1,P2) including an input member (26). A gear casing (20) is spanned between the first and second transaxles (2). A primary drive shaft (23) is disposed in the gear casing (20) so as to be drivingly connected to a prime mover (203). A traveling drive train is disposed in the gear casing (20) so as to drivingly connect the primary drive shaft (23) to the input shafts of the respective transaxles (2). A working apparatus drive train is disposed in the gear casing (20) so as to drivingly connect the primary drive shaft (23) to the input member (26) of the working apparatus driving power take-off device (P1,P2).