NOVELTY - A bipolar secondary battery (10) has a collector (11) comprising a resin layer containing a resin (a), a positive electrode active material layer (13), a bipolar-type electrode having a negative electrode active material layer (15), and an electric power generation element. The outer peripheral portion of cell layer comprising positive electrode active material layer, an electrolyte layer (17) and negative electrode active material layer is sealed by a seal portion containing a resin (b).    USE - Bipolar secondary battery e.g. lithium ion secondary battery is used for assembled battery for vehicle (all claimed). Uses include but are not limited to motorbike, passenger car, truck, bus and electric train.    ADVANTAGE - The bipolar secondary battery has excellent charging/discharging characteristics. The peeling of active material layer from the collector surface in the bipolar secondary battery is suppressed. The vehicle comprising the bipolar secondary battery has reduced fuel consumption.    DETAILED DESCRIPTION - A bipolar secondary battery has a collector comprising a resin layer containing a resin (a) and having electroconductivity, a positive electrode active material layer formed on a surface of the collector, a bipolar-type electrode having a negative electrode active material layer formed on the other surface of the collector, and an electric power generation element in which an electrolyte layer is laminated. The outer peripheral portion of cell layer comprising positive electrode active material layer, electrolyte layer and negative electrode active material layer is sealed by a seal portion containing a resin (b). The maximum component of resin (a) and maximum component of resin (b) are same polymeric material.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of the bipolar secondary battery.    Bipolar secondary battery (10)    Collector (11)    Positive electrode active material layer (13)    Negative electrode active material layer (15)    Electrolyte layer (17)