A suspension arm assembly for a vehicle includes a pivot pipe pivotally attached to a vehicle body frame, a pair of pipes extending in a lateral direction of a vehicle body, a joint member attached to distal end portions of the pipes, and a substantially U-shaped band. Proximal end portions of the pipes are connected to the pivot pipe and spaced apart from each other in a front-rear direction, and distal end portions thereof are arranged close to each other, thereby forming a substantially triangular profile. The joint member includes a plate portion and a boss portion having a knuckle attached thereto. The distal end portions of the pipes are operatively connected to a convex surface of the U-shaped band, and the plate portion of the joint member is attached to the pipes for covering the U-shaped band.