A vehicle braking control device, the brake control comprising: an input member that is moved forward and backward by operation of a brake pedal; an assist member disposed to be capable of moving in a relative manner with respect to a direction of movement of the input member; a force-multiplying actuator that moves the assist member forward and backward, and varies the degree of relative displacement between the input member and the assist member; and a control means for setting, on the basis of the amount the brake pedal is operated, a target value of the degree of relative displacement between the input member and the assist member, and controlling the assist actuator so that the degree of relative displacement matches the target value, a force-multiplied hydraulic brake pressure being generated in a master cylinder by an assist thrust imparted to the assist member in response to a movement of the input member, wherein the vehicle braking control device being characterised in that it further comprises: a reference map preset with a characteristic representing the relationship between the amount of fluid consumed by braking and a master cylinder pressure; an amount-of-fluid-consumed-in-braking-estimating means for calculating an estimated amount of fluid consumed by braking, which is the amount of fluid consumed in braking for implementing a braking force based on the brake pedal operating amount; and a master-cylinder pressure-detection means (13, 14) for detecting an actual master-cylinder pressure, the control means, when the characteristic representing the relationship between the estimated amount of fluid consumed by braking and the actual master-cylinder pressure has a difference with regard to the reference map, correcting the target value of the degree of relative displacement between the input member and the assist member in a direction in which the characteristics difference is reduced. an input member that is moved forward and backward by operation of a brake pedal; an assist member disposed to be capable of moving in a relative manner with respect to a direction of movement of the input member; a force-multiplying actuator that moves the assist member forward and backward, and varies the degree of relative displacement between the input member and the assist member; and a control means for setting, on the basis of the amount the brake pedal is operated, a target value of the degree of relative displacement between the input member and the assist member, and controlling the assist actuator so that the degree of relative displacement matches the target value, a force-multiplied hydraulic brake pressure being generated in a master cylinder by an assist thrust imparted to the assist member in response to a movement of the input member, wherein the vehicle braking control device being characterised in that it further comprises: a reference map preset with a characteristic representing the relationship between the amount of fluid consumed by braking and a master cylinder pressure; an amount-of-fluid-consumed-in-braking-estimating means for calculating an estimated amount of fluid consumed by braking, which is the amount of fluid consumed in braking for implementing a braking force based on the brake pedal operating amount; and a master-cylinder pressure-detection means (13, 14) for detecting an actual master-cylinder pressure, the control means, when the characteristic representing the relationship between the estimated amount of fluid consumed by braking and the actual master-cylinder pressure has a difference with regard to the reference map, correcting the target value of the degree of relative displacement between the input member and the assist member in a direction in which the characteristics difference is reduced. a reference map preset with a characteristic representing the relationship between the amount of fluid consumed by braking and a master cylinder pressure; an amount-of-fluid-consumed-in-braking-estimating means for calculating an estimated amount of fluid consumed by braking, which is the amount of fluid consumed in braking for implementing a braking force based on the brake pedal operating amount; and a master-cylinder pressure-detection means (13, 14) for detecting an actual master-cylinder pressure, the control means, when the characteristic representing the relationship between the estimated amount of fluid consumed by braking and the actual master-cylinder pressure has a difference with regard to the reference map, correcting the target value of the degree of relative displacement between the input member and the assist member in a direction in which the characteristics difference is reduced.