Biphenyltetracarboxylic dianhydride, 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, [isopropylidenebis (p-phenyleneoxy)] diphthalic dianhydride It is obtained by reacting at least one tetracarboxylic dianhydride component with at least one diamine component among oxydianiline, phenylenediamine, and 2,2-bis [4- (4-aminophenoxy) phenyl] propane. A current collector for a bipolar lithium ion secondary battery having a conductive polyimide layer in which a conductivity-imparting agent is dispersed in a polyimide resin obtained by imidizing a polyamic acid is excellent in the solvent barrier property of an electrolyte solution. A bipolar lithium ion secondary battery with high reliability can be obtained.
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