NOVELTY - The battery has a separator (70) equipped with base material (72) and a filler layer (74). The filler layer contains inorganic filler, carbon particle and binder, where DBP absorbed quantity of the carbon particle contained in the filler layer is greater 200 ml/100g, average primary particle diameter of the carbon particle contained in the filler layer is less than 40 nm, content rate of the carbon particle is set 10 mass % to 30 mass % and content rate of the binder is set 30 mass % to 50 mass % when total mass of the filler layer is set to 100 %.    USE - Secondary battery i.e. lithium ion secondary battery, for use as a vehicle driving power supply for driving a motor i.e. electric motor, of a vehicle e.g. motor vehicle, hybrid vehicle and electric vehicle. Can also be used as a non-aqueous electrolyte solution secondary battery and a nickel-hydrogen battery.    ADVANTAGE - The filler layer contains the inorganic filler, the carbon particle and the binder such that the DBP absorbed quantity of the carbon particle contained in the filler layer is greater 200 ml/100g, the average primary particle diameter of the carbon particle contained in the filler layer is less than 40 nm, the content rate of the carbon particle is set 10 mass % to 30 mass % and the content rate of the binder is set 30 mass % to 50 mass % when the total mass of the filler layer is set to 100 %, so that shrinking of distance between positive-negative electrodes can be suppressed even if the separator shrinks along thickness direction by external force such as restraint pressure and need to produce electro-conductive foreign material mixed in the separator cross-linked between the positive-negative electrodes can be avoided, thus preventing micro short circuit resulting from the electro-conductive foreign material.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of a winding electrode body in a state in which a winding electrode body is disconnected along radial direction.    Winding electrode body (20)    Negative electrode sheet (60)    Separator (70)    Base material (72)    Filler layer (74)