A battery temperature control apparatus capable of controlling the temperature of a battery to reach a suitable condition is provided. Thermal capacity determining unit 61, based on the temperature of battery 1 detected by battery temperature detector 2 and a target temperature stored in storage unit 5, determines the thermal capacity necessary for setting the temperature of battery 1 to the target temperature. Temperature regulating ability determining unit 62, based on the temperature of battery 1 detected by battery temperature detector 2 and the temperature of the temperature regulating medium detected by medium temperature detector 4, determines the temperature regulating ability of fan 3. Flow rate controller 63, based on the thermal capacity determined by thermal capacity determining unit 61 and the temperature regulating ability determined by temperature regulating ability determining unit 62, controls the flow rate of the temperature regulating medium sent by the fan. The temperature of battery 1 becomes close to the target temperature due to the temperature regulating medium sent from fan 3.