To realize slipping-off prevention of an FPC by installing an inexpensive FPC holding member without changing a housing shape of a connector for the FPC.

In a structure in which holding of the FPC connected to the connector for the FPC on a substrate is assisted, the FPC holding member having a protruding part at an opening part into which the FPC can be inserted is engaged with and fixed to a substrate having the opening, thereby regulating movement of the FPC passing through the opening part of the FPC holding member, and enabling slipping-off prevention of the FPC by being capable of reducing a load applied to a connection part of the connector for the FPC.