NOVELTY - A bipolar-type secondary battery (30) is formed by laminating two or more bipolar-type electrodes (34) having positive electrode active material layer (32) and negative electrode active material layer (33). The total resistance value of collector (31) in thickness direction is 1/1000000-1/100 with respect to total internal resistance. The positive electrode active material layer and/or negative electrode active material layer includes electroconductive substance in which the size of aggregates is 600 times or less of primary particle diameter of electroconductive substance.    USE - Bipolar-type secondary battery is used for assembled battery for vehicle (both claimed) like hybrid vehicle, motor vehicle and electric vehicle.    ADVANTAGE - The bipolar-type secondary battery has improved discharge efficiency. The variation in electric potential along the surface direction of electrode is reduced. The electroconductive substance is uniformly distributed along the surface direction of active-material layer.    DETAILED DESCRIPTION - A bipolar-type secondary battery is formed by laminating two or more bipolar-type electrodes in which a positive electrode active material layer is formed in one surface of a collector, and a negative electrode active material layer is formed in the other surface in series on both sides of an electrolyte layer (35). The total resistance value of collector along thickness direction is 1/1000000-1/100 with respect to total internal resistance. The positive electrode active material layer and/or negative electrode active material layer includes electroconductive substance in which the size of aggregates is 600 times or less of the primary particle diameter of electroconductive substance. The distance between aggregates distributed in positive electrode active material layer or negative electrode active material layer is 1000 mu m or more.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of laminated flat bipolar-type lithium ion secondary battery.    Bipolar-type secondary battery (30)    Collector (31)    Positive electrode active material layer (32)    Negative electrode active material layer (33)    Bipolar-type electrode (34)    Electrolyte layer (35)