A branch blood vessel insertion catheter has a catheter body having a lumen penetrating therethrough from a distal end of the catheter body to a proximal end thereof to allow a guide wire to be inserted therethrough. The catheter body has an inner layer, a wire-wound reinforcing member provided on an outer surface of the inner layer, and an outer layer covering both the inner layer and the reinforcing member. The catheter body has a first physical property change point located at a position apart from a distal end of the catheter at a distance of 3.0 to 7.0 mm and a rigidity of a portion of the catheter body located proximally from the first physical property change point is set higher than that of a portion of the catheter body located distally from the first physical property change point.
