A walking training system includes a detection unit that detects whether a leg portion of a walking trainee on which a walking assistance apparatus has been mounted has performed a walking operation or a stepping operation on a belt of a treadmill on which the walking trainee performs walking training, and a controller maintains an operation prohibition state in which a rotational operation of the belt is not started until the time that the detection unit detects the walking operation or the stepping operation a predetermined number of times and cancels the operation prohibition state after the detection unit detects the walking operation or the stepping operation the predetermined number of times.