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Patent Granted PROBLEM TO BE SOLVED: To provide a leg exercise apparatus by electrical stimulation where a user can perform bending and stretching exercise of his legs easily and smoothly while he lies on his back. ; SOLUTION: The leg exercise apparatus is for moving the muscles of the legs 110 forcedly for exercise (performing the bending and stretching exercise of the legs 110 forcedly) by the electrical stimulation to the legs 110 of the user.