A band pass filter is suitable to be formed in a multi-layered circuit substrate of a wireless communication module. The band pass filter includes an input port, a first inductor, a first capacitor, a first parasitic capacitor, a second capacitor, a second inductor, a second parasitic capacitor, a third inductor, a third parasitic capacitor and a output. The input port, first inductor, first capacitor, second capacitor, third inductor and output port are sequentially electrically connected in series. The first parasitic capacitor is induced between the first inductor, first capacitor and a ground. The second inductor is electrically connected to the first capacitor, second capacitor and ground. The second parasitic capacitor is induced between the second inductor, first capacitor, second capacitor and ground. The second parasitic capacitor is electrically connected in parallel with the second inductor. The third parasitic capacitor is induced between the third inductor, second capacitor and ground.