An error correcting device and a working vehicle, wherein the error correcting device is mounted in the working vehicle and configured to correct an error in measurement value of a sensor device having a GNSS sensor and a gyro sensor, the correcting device comprising: a first acquisition part that is configured to acquire a vehicle position of the working vehicle in a local coordinate system, the GNSS sensor being configured to measure the vehicle position, and an angular velocity in a sensor coordinate system having three axes set with reference to the sensor device, the gyro sensor being configured to measure the angular velocity, characterized in that the correcting device further comprises: a coordinate transformation part that is configured to coordinate-transform, based on the acquired angular velocity, a relative position vector of a measurement position in the sensor coordinate system at which the sensor device is provided, the relative position vector extending from a set position set at a different position from the position of the sensor device in the sensor coordinate system, to a relative position vector in the local coordinate system; and a vehicle position correcting part that is configured to calculate a position vector P a of the set position extending from an origin of the local coordinate system according to an expression of P a = P s - L, wherein P s denotes a position vector of the measurement position and L denotes the coordinate-transformed relative position vector, to correct an error in the vehicle position measured by the GNSS sensor. a first acquisition part that is configured to acquire a vehicle position of the working vehicle in a local coordinate system, the GNSS sensor being configured to measure the vehicle position, and an angular velocity in a sensor coordinate system having three axes set with reference to the sensor device, the gyro sensor being configured to measure the angular velocity, characterized in that the correcting device further comprises: a coordinate transformation part that is configured to coordinate-transform, based on the acquired angular velocity, a relative position vector of a measurement position in the sensor coordinate system at which the sensor device is provided, the relative position vector extending from a set position set at a different position from the position of the sensor device in the sensor coordinate system, to a relative position vector in the local coordinate system; and a vehicle position correcting part that is configured to calculate a position vector P a of the set position extending from an origin of the local coordinate system according to an expression of P a = P s - L, wherein P s denotes a position vector of the measurement position and L denotes the coordinate-transformed relative position vector, to correct an error in the vehicle position measured by the GNSS sensor. a coordinate transformation part that is configured to coordinate-transform, based on the acquired angular velocity, a relative position vector of a measurement position in the sensor coordinate system at which the sensor device is provided, the relative position vector extending from a set position set at a different position from the position of the sensor device in the sensor coordinate system, to a relative position vector in the local coordinate system; and a vehicle position correcting part that is configured to calculate a position vector P a of the set position extending from an origin of the local coordinate system according to an expression of P a = P s - L, wherein P s denotes a position vector of the measurement position and L denotes the coordinate-transformed relative position vector, to correct an error in the vehicle position measured by the GNSS sensor.