An anchor member supports a frame-shaped member. A first input electrode is located outside the frame-shaped member and separate from the frame-shaped member and fixed to a substrate. A second input electrode includes an electrode portion located outside the frame-shaped member and connected to the frame-shaped member. The second input electrode is displaceable in a prescribed direction. A first reference electrode is inside the frame-shaped member and fixed to the substrate. A second reference electrode includes an electrode portion located inside of the frame-shaped member and connected to the frame-shaped member. The second reference electrode is displaceable in the prescribed direction. In the structural component, the first input electrode and the electrode portion of the second input electrode are located between the frame-shaped member and a weight member in the prescribed direction in plan view in a thickness direction defined with respect to the substrate.