An apparatus for fall prevention during walking includes a first wire (11e) and a second wire (11f), which are coupled to a right upper ankle belt (6a) and a right lower ankle belt (7a), a third wire (11g) and a fourth wire (11 h), which are coupled to a left upper ankle belt (6b) and a left lower ankle belt (7b), an obtainer (200) that obtains information about a road surface where a user walks, and a controller (40) that controls a tension of the first wire (11e) and a tension of the second wire (11f) at the same time and controls a tension of the third wire (11g) and a tension of the fourth wire (11 h) at the same time by using a first stiffness target value, a second stiffness target value, a third stiffness target value, and a fourth stiffness target value that are determined on the basis of the information about the road surface. The first stiffness target value, the second stiffness target value, the third stiffness target value, and the fourth stiffness target value correspond to the first wire (11e), the second wire (11f), the third wire (11g), and the fourth wire (11h), respectively.
