To provide a core-back foaming molding die which can make the degree of freedom for the structure of a moldable foaming molded article high, and to provide a manufacturing method of an engine cover for vehicle.

The core-back foaming molding die 10 has a structure wherein a core guide hole 13 which communicates with a cavity 30 is installed on a fixed die 11, and a following core 40 is housed in the same in a manner to be directly movable, and a following movable body 56 which directly moves in the same direction with a core-back movable die 20 while being arranged on the outside of the cavity 30 is connected with the following core 40 on the back surface side of the fixed die 11. Then, the following core 40 follows the core-back motion of the core-back movable die 20 when the following movable body 56 comes into contact with the core-back movable die 20 and directly moves. Thus, at a part where the following core 40 is arranged in the cavity 30, the expansion amount of the cavity 30 by core-back becomes smaller compared with other parts.