To provide a device for confirming the position of a flying body that intercepts the exchange between the query signal of a secondary radar device and the response signal of the flying body, and can detect the azimuth angle and horizontal distance of the flying body.

A directional reception antenna 6 intercepts a query radio wave 2a. A non-direction reception antenna 7 intercepts a response radio wave 3b. An operation circuit 2 interprets the response radio wave 3b for obtaining information on height H of a flying body P1. An azimuth angle θ2 of a directional transmission/reception antenna 1 of a secondary radar device SSR on the discharge of the query radio wave 2a corresponding to the response radio wave 3b is calculated, time from the discharge of the query radio wave 2a corresponding to the response radio wave 3b to the reception of the response radio wave 3b is calculated, required operation is made according to the azimuth angle θ2, the distance K between the position-confirming device of the flying body and the secondary radar device, and the height H of the flying body P1, horizontal distance C1 from a secondary radar sight to the flying body P1, and horizontal distance D1 from the position-confirming device to the flying body P1, and an azimuth angle θ5 of the flying body P1 from the position-conforming device of the flying body are calculated for displaying on a display 9.