A compound die is a composite die that simultaneously completes multiple different processing steps (e.g., blanking, bending, drawing, etc.) within a single die in press working. This reduces the number of material feeding steps and achieves a significant improvement in production efficiency and process integration. In particular, it is suitable for mass production of small parts and parts with complex shapes, and while maintaining high dimensional accuracy and stable quality, it contributes to reducing manufacturing costs. A typical example of this processing is a "blanking compound die" that performs outer profile blanking and inner hole blanking simultaneously. Although the die structure becomes complex, the significant advantages such as reduced setup time and elimination of intermediate steps lead to its widespread use in various fields such as automotive parts, electronic components, and home appliance parts.