A temperature controller, for a battery, includes: a temperature control part configured to control a temperature of the battery by a phase change of a heat medium between a liquid phase and a gas phase; a gas phase flow passage through which a gas phase heat medium that flows out of the temperature control part flows; a heat medium cooling part configured to condense the gas phase heat medium that flows in from the gas phase flow passage; and a liquid phase flow passage through which the liquid phase heat medium flows from the heat medium cooling part to the temperature control part, the temperature control part and the heat medium cooling part being arranged such that a liquid surface of the liquid phase heat medium in the heat medium cooling part is positioned on an upper side than a liquid surface of the liquid phase heat medium in the temperature control part.