A heat management device may include: a heat circuit comprising a heat exchanger passage, a radiator passage communicating with the heat exchanger passage, and a battery passage communicating with the heat exchanger passage by bypassing the radiator passage; a heat exchanger cooling heat medium by heat exchange; a radiator exchanging heat between outside air and the heat medium in the radiator passage; a control valve changing a channel of the heat medium in the heat circuit; a pump pumping out the heat medium in the heat circuit from the heat exchanger passage to the battery passage and from the heat exchanger passage to the radiator passage; and a controller. The controller may execute: a heating operation for heating the heat medium in the battery passage by a battery; and a circulation operation for cooling the heat medium in the radiator passage by the radiator.