An error correction apparatus 34 is for correcting an error of a measured value obtained by a sensor device that is provided to a work vehicle and that is provided with a GNSS sensor and a gyro sensor, and is provided with: a first acquisition unit 341 that acquires the vehicle position of the work vehicle on a local coordinate system, the position having been measured by the GNSS sensor, and acquires an angular velocity on a sensor coordinate system that has three axes and that uses the sensor device as a reference, the angular velocity having been measured by the gyro sensor； a coordinate transformation unit 345 that performs, on the basis of the acquired angular velocity, coordinate transformation on the relative position vector at a measurement position at which the sensor device is disposed in the sensor coordinate system, the vector having the starting point at a set position set at a different position from the sensor device, into a relative position vector on the local coordinate system； and a vehicle position correction unit 346 that corrects an error of the vehicle position measured by the GNSS sensor through calculation of the position vector Pa of the set position by using a formula: Pa=Ps-L, where the position vector of the set position with the origin of the local coordinate system being defined as the starting point is denoted by Pa, the position vector at the measurement position is denoted by Ps, and the relative position vector having undergone coordinate transformation is denoted by L.Selon l'invention, un appareil de correction d'erreur (34) est destiné à corriger une erreur d'une valeur mesurée obtenue par un dispositif capteur qui est disposé sur un véhicule de travail et qui est pourvu d'un capteur GNSS et d'un capteur gyroscopique, et comprend : une première unité d'acquisition (341) qui acquiert la position de véhicule du véhicule de travail sur un système de coordonnées locales, la position ayant été mesurée par le capteur GNSS, et acquiert
