A method for manufacturing an anisotropic conductive adhesive sheet is disclosed. The ILD layer defines a via that extends through it to the first metal layer. To a lower face of said front visor portion, there are attached a pair of right and left front illumination lamps, and there is provided an upper concave portion at the rightleft center thereof. The pump takes suction flow from the dummy well and boosts the flow energy of the discharge flow of hydrocarbon fluids. The total concentration of KOH bath is measured by using a refractometer and the measurement result is corrected by the estimated K2H2SiO4 concentration.