PURPOSE: To facilitate installation and removal of a portable driving auxiliary device by connecting a handle lever free to reciprocally move a pair of left and right expansion arms, installing a base plate on a handle shaft, fixing an expansion rod for bridging between the handle shaft and a car body and making it free to disconnect an existing handle shaft by a bracket.

CONSTITUTION: Rods 6a, 6b to alternately pressurize an accelerator pedal and a brake pedal are projectively provided on a head end of a frame a part of a pair of left and right expansion arms 4a, 4b of which is bent. Thereafter, the expansion arms 4a, 4b are connected to a handle lever 10 for operation through screw bars 8a, 8b and adjustment screws 9a, 9b to rods 7a, 7b. The handle bar 10 is made free to disconnect by a coupler part 10a so that a handle of an optional shape and dimension can be exchanged and it is fixed by a pin 10b. Additionally, it is possible to make a base plate portable by fixing an expansion rod 12 for bridging between a handle shaft 16 and a car body floor 19 and making it free to disconnect it by brackets 2a, 2b, 3.