A work-vehicle position measurement device comprising: a reference station provided on a ground to receive a radio wave from a satellite to conduct measurement of an own position and to transmit a result of the measurement to a work vehicle (1, 2) comprised by the work-vehicle position measurement device; wherein the work vehicle (1, 2) is comprising: a position calculation unit configured to execute position calculation of obtaining an own vehicle position in a work target field (A, B, C, D, E, F), in accordance with information received via the radio wave from the satellite and the result of the measurement transmitted from the reference station; a travel control unit configured to control a travel state of a vehicle body so that the vehicle body travels along a set route in accordance with a result of the calculation by the position calculation unit; and a position information management unit configured to manage map data of the work target field (A, B, C, D, E, F) and comprising a storage device configured to store position information on the reference station which is preliminarily set with respect to the field (A, B, C, D, E, F), and a display device, wherein the reference station is portable to be placed at an arbitrary position, and the display device is configured to display the field (A, B, C, D, E, F), a set position of the reference station, and a current position of the reference station in the map. a reference station provided on a ground to receive a radio wave from a satellite to conduct measurement of an own position and to transmit a result of the measurement to a work vehicle (1, 2) comprised by the work-vehicle position measurement device; wherein the work vehicle (1, 2) is comprising: a position calculation unit configured to execute position calculation of obtaining an own vehicle position in a work target field (A, B, C, D, E, F), in accordance with information received via the radio wave from the satellite and the result of the measurement transmitted from the reference station; a travel control unit configured to control a travel state of a vehicle body so that the vehicle body travels along a set route in accordance with a result of the calculation by the position calculation unit; and a position calculation unit configured to execute position calculation of obtaining an own vehicle position in a work target field (A, B, C, D, E, F), in accordance with information received via the radio wave from the satellite and the result of the measurement transmitted from the reference station; a travel control unit configured to control a travel state of a vehicle body so that the vehicle body travels along a set route in accordance with a result of the calculation by the position calculation unit; and a position information management unit configured to manage map data of the work target field (A, B, C, D, E, F) and comprising a storage device configured to store position information on the reference station which is preliminarily set with respect to the field (A, B, C, D, E, F), and a display device, wherein the reference station is portable to be placed at an arbitrary position, and the display device is configured to display the field (A, B, C, D, E, F), a set position of the reference station, and a current position of the reference station in the map.