A temperature control device includes a smoother including a smoothing channel through which fluid from a first inlet flows, and a first outlet from which the fluid flowed through the smoothing channel flows out, the smoother making a temperature fluctuation amount of the fluid in the first outlet smaller than that in the first inlet, a thermoregulator including a second inlet into which the fluid from the first outlet flows, a thermoregulating channel through which the fluid from the second inlet flows, a thermoregulating unit regulating a temperature of the fluid flowing through the thermoregulating channel, and a second outlet from which the fluid flowed through the thermoregulating channel flows out, calculating a temperature regulation amount of the thermoregulating unit, based on temperature of the fluid in the smoothing channel, and calculating the temperature regulation amount, based on temperature of the fluid at a position downstream of the second outlet.