Abstract: A high voltage variable resistor includes a variable resistance board, a substantially rectangular flat fixed-resistance board, and a high-voltage capacitor housed in a case such that one surface thereof is open. The fixed-resistance board is arranged such that a longer side extends from the bottom surface to the opening surface of the case.

Abstract: An annular resistor member having two non-contact ends is overlaid and adhered on the surface of a base, and a rotational shaft located at the central portion of the resistor member is pivotally axially supported via a bearing. A bent electrode arm is fitted on the rotational shaft, and is connected to an output terminal via the rotational shaft or a connection means. A movable electrode, which opposes to the resistor member via a gap, is integrally formed on the end portion of the electrode arm, and a capacitor is formed between the movable electrode and the resistor member. In the above structure, when an AC power supply is flowed across the two ends of the resistor member, the capacitor is formed between the movable electrode and the resistor member, and an attenuated voltage is generated on the movable electrode.