Abstract: A simulation apparatus for confirming an optimized installation position of a detector of a chemical substance plant, which is capable of confirming the optimal installation position of a detector while directly displaying chemical substances stored in the chemical substance plant, a leakage source, and positions of detectors. The simulation apparatus for confirming an optimized installation position of a detector of a chemical substance plant according to the present invention includes a screen manager, a process manager, a detailed setting manager, an image display screen manager, a link manager, a 3D plant image manager, a chemical substance selection manager, a leakage source designation manager, a candidate detector installation manager, and a detector optimization manager.