A tracking device, comprising: a correction target area setting module configured to set an area in which an unnecessary echo tends to be generated based on one of a structure and behavior of a ship, to be a correction target area, and comprising a wake area setting module configured to set a wake area (131, 132, 133, 134, 135); a correction target echo extracting module configured to extract a target object echo (ED2, ED3, ED4, ED5, ED6, ED7, ED8) within the wake area (131, 132, 133, 134, 135) from a plurality of detected target object echoes (ED1 ED2, ED3, ED4, ED5, ED6, ED7, ED8), as a correction target echo; a scoring module configured to score a matching level between previous echo information on a target object echo that is a previous tracking target and detected echo information on each of the plurality of detected target object echoes (ED1 ED2, ED3, ED4, ED5, ED6, ED7, ED8), based on the previous echo information, the detected echo information, and the extraction result by the correction target echo extracting module, wherein the scoring module scores the target object echo within the wake area (131, 132, 133, 134, 135) to be lower than that outside the wake area (131, 132, 133, 134, 135); and a determining module configured to determine a target object echo as a current tracking target from the plurality of target object echoes (ED1 ED2, ED3, ED4, ED5, ED6, ED7, ED8), by using the scored result, wherein the wake area setting module is configured to set a wake area (131, 132, 133, 134, 135) based on the previous echo information, with reference to a current estimated position of the previous tracking target, by using the previous echo information, and the wake area is set to have a fan shape having the estimated position at its vertex and an angle of approximately 39°, a bisector of the angle extending from the vertex and to a direction opposite from an estimated moving direction of the previous tracking target, wherein the wake area (131, 132, 133, 134, 135) is divided into a plurality of subareas in the angular direction, having the opposite direction of the estimated moving direction therebetween.. a correction target area setting module configured to set an area in which an unnecessary echo tends to be generated based on one of a structure and behavior of a ship, to be a correction target area, and comprising a wake area setting module configured to set a wake area (131, 132, 133, 134, 135); a correction target echo extracting module configured to extract a target object echo (ED2, ED3, ED4, ED5, ED6, ED7, ED8) within the wake area (131, 132, 133, 134, 135) from a plurality of detected target object echoes (ED1 ED2, ED3, ED4, ED5, ED6, ED7, ED8), as a correction target echo; a scoring module configured to score a matching level between previous echo information on a target object echo that is a previous tracking target and detected echo information on each of the plurality of detected target object echoes (ED1 ED2, ED3, ED4, ED5, ED6, ED7, ED8), based on the previous echo information, the detected echo information, and the extraction result by the correction target echo extracting module, wherein the scoring module scores the target object echo within the wake area (131, 132, 133, 134, 135) to be lower than that outside the wake area (131, 132, 133, 134, 135); and a determining module configured to determine a target object echo as a current tracking target from the plurality of target object echoes (ED1 ED2, ED3, ED4, ED5, ED6, ED7, ED8), by using the scored result, wherein the wake area setting module is configured to set a wake area (131, 132, 133, 134, 135) based on the previous echo information, with reference to a current estimated position of the previous tracking target, by using the previous echo information, and the wake area is set to have a fan shape having the estimated position at its vertex and an angle of approximately 39°, a bisector of the angle extending from the vertex and to a direction opposite from an estimated moving direction of the previous tracking target, wherein the wake area (131, 132, 133, 134, 135) is divided into a plurality of subareas in the angular direction, having the opposite direction of the estimated moving direction therebetween..