A purpose of the present invention is to provide a floating-body type wind power generating device equipped with a mooring device capable of securely mooring a floating body against drift force and turning moment. Provided is a floating-body type wind power generating device (1) equipped with a floating body (20) which floats on a water surface, a wind power generator (10) provided to the floating body, and a mooring device (36) for mooring the floating body. In a planar view, the floating body (20) forms a virtual triangle shape having three vertices. The mooring device (36) includes: a first mooring cable (34b) which is connected to, from among the three vertices of the virtual triangle shape, one of the two vertices excluding the vertex having the largest internal angle, or in cases when there are two or more vertices having the largest internal angle, one of the two vertices excluding an arbitrary vertex from among the two vertices which have the largest internal angle; and a second mooring cable (34c) which is connected to the other of the two vertices. In a planar view, the first mooring cable and the second mooring cable are separated from the floating body (20), each extending in a direction which intersects the other.