A low pass filter resonant rod is provided to improve an attenuation characteristic of a low pass filter by protrusively forming an outer circumference end along a length direction of inductor units. A low pass filter resonant rod includes an input terminal(11), an output terminal(12), a plurality of inductor units(13), and a plurality of capacitor units(14). The input terminal is formed on an end of the low pass filter resonant rod. The output terminal is formed on the other end of the low pass filter resonant rod. The inductor units connect the input terminal to the output terminal. A center of the capacitor units is connected to the inductor units. A side unit of a part or all parts of the capacitor units is protrusively formed along a length direction of the inductor units. The capacitor unit is formed in a circular plate shape. An outer circumference end of the capacitor unit is protrusively formed along a length direction of the inductor unit.
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