Abstract: To provide an electric circuit structure with which the occurrence of sound generation caused by vibration of a circuit element mounted on a flexible substrate connected to a circuit board is suppressed.

Abstract: Provided is an electric circuit structure for solving the problem that a flexible substrate adhered to a back face of a mechanical member is peeled off due to repulsion generated at a folding part of the flexible substrate connected to a circuit board. The structure is provided with; a bottomed and frame-shaped mechanical member (9); a circuit substrate (1) that is to be housed inside the mechanical member (9) and that has an electric circuit element formed on the surface of the substrate; and a flexible substrate (10) that has a connection terminal formed at one end part (10a) and connected to an electrode terminal (7) formed on the circuit board (1) and that is folded at a folding part (10b) on a side face of the mechanical member (9) while being adhered at another end part (10c) opposite to the end part (10a), to the back face of the mechanical member (9).

Abstract: To provide an electric circuit structure with which the occurrence of sound generation caused by vibration of a circuit element mounted on a flexible substrate connected to a circuit board is suppressed.