A wheel load estimation device includes a wheel speed acquisition unit, a frequency characteristic ratio calculation unit, a load ratio calculation unit, and a wheel load calculation unit. The wheel speed acquisition unit acquires wheel speed information of each wheel included in the vehicle. The frequency characteristic ratio calculation unit calculates a front-to-rear frequency characteristic ratio and a left-to-right frequency characteristic ratio. The load ratio calculation unit calculates the front-to-rear load ratio and the left-to-right load ratio. The wheel load calculation unit calculates, a wheel load ratio representing a relative wheel load among the wheels included in the vehicle, for at least one of the wheels of the vehicle. The load ratio calculation unit calculates the front-to-rear load ratio by taking a linear combination of the calculated two or more front-to-rear gain ratios using weights that are different from one another.