A floating type wind turbine generating apparatus comprising: a wind turbine generator; a floating body including a first column which is disposed on an upwind side in a main wind direction and on which the wind turbine generator is disposed, a second column and a third column disposed on a downwind side with respect to the first column in the main wind direction, and two lower hulls (24a, 24b) one of which connecting the first and second columns (22a,22b) and other of which connecting the first and third columns (22a,22c); and a plurality of mooring cables each of which connecting the floating body and an anchor (32a,32b) fixed on a bottom of a water in a catenary curve, the floating type wind turbine generating apparatus being characterized in that at least two of the mooring cables (34a,34b) are connected to the first column, at least one of the mooring cables (34c,34d,34e) is connected to the second column, and at least one of the mooring cables (34f,34g,34h) is connected to the third column, the mooring cables extending radially from the floating body so as not to intersect with one another in a planar view, in that the at least one mooring cable connected to the second column includes a rotation preventing mooring cable extending toward a region (α) on a first column side, the region defined by a bisector (a) at an intersection of the two lower hulls (24a,24b) and by a straight line (b) which is orthogonal to the bisector (a) and which passes through a center of the second column, and in that the at least one mooring cable connected to the third column includes a rotation preventing mooring cable extending toward a region (β) on the first column side, the region defined by a bisector (a) at an intersection of the two lower hulls (24a,24b) and by a straight line (c) which is orthogonal to the bisector and which passes through a center of the third column. a wind turbine generator; a floating body including a first column which is disposed on an upwind side in a main wind direction and on which the wind turbine generator is disposed, a second column and a third column disposed on a downwind side with respect to the first column in the main wind direction, and two lower hulls (24a, 24b) one of which connecting the first and second columns (22a,22b) and other of which connecting the first and third columns (22a,22c); and a plurality of mooring cables each of which connecting the floating body and an anchor (32a,32b) fixed on a bottom of a water in a catenary curve, the floating type wind turbine generating apparatus being characterized in that at least two of the mooring cables (34a,34b) are connected to the first column, at least one of the mooring cables (34c,34d,34e) is connected to the second column, and at least one of the mooring cables (34f,34g,34h) is connected to the third column, the mooring cables extending radially from the floating body so as not to intersect with one another in a planar view, in that the at least one mooring cable connected to the second column includes a rotation preventing mooring cable extending toward a region (α) on a first column side, the region defined by a bisector (a) at an intersection of the two lower hulls (24a,24b) and by a straight line (b) which is orthogonal to the bisector (a) and which passes through a center of the second column, and in that the at least one mooring cable connected to the third column includes a rotation preventing mooring cable extending toward a region (β) on the first column side, the region defined by a bisector (a) at an intersection of the two lower hulls (24a,24b) and by a straight line (c) which is orthogonal to the bisector and which passes through a center of the third column.