US Patent 10277019 Electric circuit apparatus

An electric circuit apparatus capable of enhancing connection workability is provided. An electric circuit apparatus includes: a connector that transmits one or a driving current and a signal to an electric circuit unit; a substrate connected to the connector; a first case member forming an housing space for the substrate and forming an opening portion; and an intermediate member interposed between the connector and the first case member, in which the intermediate member includes a connector-side opening portion through which the connector passes, a seal surface with the connector, and a fix in portion to be fixed on the first case member, and the fixing portion is formed so as to absorb a positional tolerance between the connector and the opening portion of the first case member.