WHEEL LOAD ESTIMATION DEVICE, WHEEL LOAD ESTIMATION METHOD, AND WHEEL LOAD ESTIMATION PROGRAM

A wheel load estimation device can include a tire information acquisition unit, a wheel speed acquisition unit, a frequency characteristic ratio calculation unit, a load ratio calculation unit, and a wheel load calculation unit. The tire information acquisition unit can acquire type information specifying a type of a tire. The wheel speed acquisition unit can acquire wheel speed information representing wheel speed of each wheel of a vehicle. The frequency characteristic ratio calculation unit can calculate front-rear and left-right frequency characteristic ratios. The load ratio calculation unit can calculate front-rear and left-right load ratios. The wheel load calculation unit can calculate a wheel load ratio representing a relative wheel load. The load ratio calculation unit can calculate the front-rear and left-right load ratios, based on first relationship specification information and second relationship specification information, respectively.