A thermal management system for a vehicle includes a first pump 23 and a second pump 24, temperature adjustment target devices 31, 32, 34, 36, and 37, heat exchangers 28, 33, and 35, numerous flow paths 11 to 16 including a first pump arrangement flow path 11, a second pump arrangement flow path 12, and device arrangement flow paths 13, 14, 15, and 16, a first switching portion 21 for allowing the numerous flow paths 11 to 16 to selectively communicate with each other, a second switching portion 22 for allowing the numerous flow paths 11 to 16 to selectively communicate with each other, and a reserve tank 46 for storing therein heat medium The reserve tank 46 is configured to set the pressure of the liquid surface of the stored heat medium to a predetermined pressure (e g , atmospheric pressure), and is connected to only one flow path of the numerous flow paths 11 to 16.
