Foot training device and foot training method

A foot training device comprising:

• a fulcrum placed at a center;
• four projections projecting in different directions from the fulcrum, each of the four projections having, at least in a portion thereof, an elastic member that is bendable in a bending direction;
• and
• an elastic body layer and two protective layers that are stacked together, the elastic body layer being made of a plate-shaped resin material or rubber material, the two protective layers being made of a resin material or a rubber material having a lower elastic modulus than the elastic body layer and a higher foaming ratio than the elastic body layer, and the two protective layers being provided on two plate surfaces of the elastic member, respectively, wherein:
• the training device is configured to be used to improve foot muscle strength by bending and stretching one or more of the elastic members, at least two of the four projections have different degrees of elasticity in flexure as determined when a force is applied to a distal end of each of the at least two projections to bend the elastic member,
• the four projections project in cross directions from the fulcrum at the center, and, for each pair of projections that oppose each other across the fulcrum, the projections are arranged on a straight line, and
• none of the four projections has an annular structure.