Vehicular electric power generation control apparatus

A lithium ion battery (11) is connected in parallel to a lead acid battery (9) charged with electric power generated by a generator (2). The lithium ion battery (11) has internal resistance smaller than internal resistance of the lead acid battery (9) and is charged with electric power generated by the generator (2). An ECM (6) supplies an electric power generation command value based on a running state of a vehicle, and an ECU (7) controls the generator (2) for electric power generation by supplying the electric power generation command voltage to the generator (2).