A flange joint for structural members is provided, wherein by avoiding stress concentration at a welded portion, the cross-sectional size can be determined based on the base material strength, and a structure can be reduced in weight and size. In a flange joint for structural members, structural members are connected to each other in a state where an end face, for example, of an H-shaped steel beam is connected to a structural-member-connecting face of an end plate by welding and a non-connection face of the end plate is coupled to another structural member. The structural-member-connecting face of the end plate, to which the end face of the H-shaped steel beam is connected, is provided with recessed grooves along the shape of the welded portion of the end face.