Provided is an evaporator including a tank formed with a depressed part and a flow part having a refrigerant flow therein using a flow part forming member, separately from a first compartment and a second compartment to improve a refrigerant channel structure, in a double evaporator in which a refrigerant flows in a first column and a second column, respectively, thereby reducing the number of four inlets and outlets that is disposed in the first column and the second column, respectively, fixing a baffle at an accurate position, and reducing a defective rate to more improve productivity.