A police rank (inspector) in Japan; a mid-level officer often responsible for investigations and supervising operations.
その事件は警部が指揮して捜査を進めている。
The case is being led and investigated by a police inspector.
警部は部下に的確な指示を出した。
The inspector gave precise instructions to his subordinates.
警察ドラマでは、主人公が警部として活躍することが多い。
In police dramas, the protagonist often plays the role of a police inspector.