To prevent weakness of muscle of leg, loin and knee of an unused leg during driving, and prevent disturbance in blood circulation, by attaching a member which is freely extended/shrunk and has resistance force on a plate forming a place For the unused leg when driving an automatic vehicle, or between plates.

Each of one end of a stepping upper plate 1 and a car body fixing lower plate 2 are hinged by a freely turnable hinging part 4 so as to be connected to each other, and a spring 3 is interposed between both plates 1, 2 as a member having freely extendable/shrinkable resistance force so as to form a foot rest serving as leg/loin training tool. This tool is fixed and arranged between the lower body part 5 of a driver's seat and a cover mat 6 without disturbing driving operation. An unused foot 7 when driving is placed on this tool, and force is optionally applied or loosened to/from the tiptoe of the foot so that a load is applied to the leg and loin so as to train.