Hybrid working vehicle

A hybrid working vehicle (1) comprises an engine (3), a drive wheel (7), a power take-off (PTO) shaft (11), and a power transmission system for transmitting power from the engine (3) to the drive wheel (7) and the PTO shaft (11). The power transmission system is bifurcated at a bifurcating point (24, 39) into a traveling drive train (52) for driving the drive wheel (7) and a PTO drive train (53) for driving the PTO shaft (11). A continuously variable transmission (14) is provided on the traveling drive train (52), and a motor generator (4) is provided on the power transmission system between the engine (3) and the bifurcating point (24, 39). The motor generator (4) functions as a generator by power of the engine (3) and functions as an electric motor for driving the power transmission system. The hybrid working vehicle (1) includes a controller (100) for controlling an output rotary speed of the motor generator (4) functioning as the electric motor.