Provided are: a polymer-supported phosphane compound exhibiting excellent catalytic reaction activity; a complex including the compound and a transition metal; and a catalyst including the complex. This polymer compound includes: units of threefold styrene cross-linked phosphane; and styrene units having substituent groups (R) in position 4 (provided that R represents hydrogen, a C1-6 lower alkyl group, a C1-6 lower alkoxy group, or a polar functional group). In the formula in which the polymer compound includes structure (1), PS represents a polystyrene unit chain including the styrene units having the substituent groups (R). The complex includes the polymer and a transition metal. The catalyst for an organic compound coupling reaction includes the complex.