Heat management device for vehicle

A heat management device for a vehicle that includes an internal combustion engine and a traveling electric motor, and is able to perform hybrid vehicle traveling with the internal combustion engine operating and electric vehicle traveling with the internal combustion engine stopped, the heat management device comprising:

• an air conditioning device that includes a heater core for heating a vehicle cabin of the vehicle;
• a first flow path that circulates a cooling liquid in the internal combustion engine and the heater core;
• a second flow path that includes a bypass flow path that bypasses the internal combustion engine, the second flow path circulates the cooling liquid in a heat source different from the internal combustion engine and the heater core;
• a third flow path that allows the cooling liquid flowing through the bypass flow path to flow into at least one of the internal combustion engine and the heat source by bypassing the heater core;
• and
• a control device, wherein when the control device switches from the first flow path to the second flow path, the control device is configured to switch from the third flow path to the second flow path after switching from the first flow path to the third flow path.