Control device

A control device includes a control object output target response calculation means for calculating and designating a target response in a transient state at which an output value of a control object reaches a target value, and a control object output estimation means for estimating an output value of the control object in the transient state for reaching the target value based on the target response designated by the control object output target response calculation means, and the estimation of the output value of the control object in the control object output estimation means is carried out by an equation including time as a variable. A simple and inexpensive control device, suitable for an air conditioning unit for vehicles, is provided, which can prevent an overshooting and an undershooting of a vehicle interior temperature and can improve the comfortableness by estimating the vehicle interior temperature in a transient state in an optimum manner.