To provide a multi-purpose towed target ship wherein stability of a towed ship upon towing is improved and restoration is ensured when a ship tail is drifted by side wind without bringing any trouble to irradiation such as radar waves to a target, and wherein the target is made demountable to quickly deal with a various purpose tests.

A side float 3 is detouchably provided on opposite sides of a main float F elongated longitudinally, biased to a ship tail, A mast shaped frame 6 on which a target curtain is mounted is also provided removably with respect to the main float F. The side float 3 is positioned more above a water surface SW in a calm state. Further, a keel boad 9 is hung below the main float F.