OSCILLATING TYPE ACTUATOR

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To provide a novel oscillating type actuator capable of securing a stoppage and holding when not energized, and producing a stable, responsive and highly durable oscillating arm even using a non-rare each magnet. The actuator is constituted by a housing; a shaft supported in the housing to be axially rotatable and has an output part to produce an output; a plate-shape oscillating arm that is fixedly supported to a shaft and has a swing surface perpendicular to the axis of the shaft, the oscillating arm performing a swing in a predetermine rotation angle range; two permanent magnets arranged along a swing direction of the oscillating arm and have pole faces different from each other on the swing surface; two magnet coils opposingly arranged to respectively face the permanent magnets; and a pair of interpoles arranged around a periphery of each of the magnet coils to opposingly sandwich one of the permanent magnets arranged side by side.