A design for measuring planar elongation viscosity was considered. The apparatus consists of opposing nozzles through which the liquid is either sucked or blow out. The cross section of nozzle is square and two dimensional opposing flow is used to generate planar elongational flow. The elongational stress is estimated from a reaction force acting on the opposing nozzles. The planar elongation viscosity for CTAB/NaSal aqueous solution was measured by using this new technique, and it compared with the result which was measured by the optical technique. The measurement result shows qualitatively agreement, but quantitatively 10 times larger than the result measured by the optical technique.