Circuit board and optical unit

An optical assembly comprising:

• a movable body including an optical element;
• a fixed body that swingably supports the movable body;
• a swing mechanism that swings the movable body with respect to the fixed body;
• and
• a circuit board connected to the movable body;
• wherein
• the circuit board includes:
• a first wiring board;
• a second wiring board connected to the first wiring board;
• a third wiring board connected to the first wiring board;
• a connector;
• and
• an external terminal connector;
• the second wiring board includes a first end, a second end, and a reference portion;
• the first end of the second wiring board is connected to the first wiring board;
• the reference portion of the second wiring board is located at any position between the first end of the second wiring board and the second end of the second wiring board;
• the third wiring board includes a first end, a second end, and a different-direction reference portion;
• the first end of the third wiring board is connected to the first wiring board;
• the different-direction reference portion of the third wiring board extends in a direction different from an extending direction of the reference portion in any position between the first end of the third wiring board and the second end of the third wiring board;
• the connector electrically connects any portion between the reference portion and the second end of the second wiring board and any portion between the different-direction reference portion and the second end of the third wiring board;
• and
• the external terminal connector extends from one of the second wiring board and the third wiring board in a direction different from a direction in which the second wiring board and the third wiring board are connected by the connector, and is connected to an external terminal.