Provided is a semiconductor device including a metal dummy pattern and a thin film resistor. In detail, a semiconductor device includes a semiconductor substrate, a thin film resistor, and a metal dummy pattern. The thin film resistor disposed over the semiconductor substrate and extending in a first direction relative to the semiconductor substrate. The metal dummy pattern disposed between the semiconductor substrate and the thin film resistor, the metal dummy pattern including a reflective pattern extending in the first direction semiconductor substrate and spatially corresponding to a periphery of the thin film resistor.