A temperature control device controls the temperature of a controlled object by circulating a fluid in a temperature adjustment unit arranged near the controlled object. The temperature control device comprises a heating pathway that heats and circulates the fluid in the temperature adjustment unit, a cooling pathway that cools and circulates the fluid in the temperature adjustment unit, a bypass pathway that does not pass the fluid through the heating pathway and cooling pathway, but circulates the fluid in the temperature adjustment unit, and adjustment means that adjust a flow ratio of the fluid that is supplied from the heating pathway, cooling pathway, and bypass pathway to the temperature adjustment unit via a confluence unit that combines these flows. The adjustment means are provided on a downstream side of each of the heating pathway, the cooling pathway, and the bypass pathway and on the upstream side of the confluence unit.