IN-VEHICLE ELECTRIC COMPONENT-INTERNAL CIRCUIT UNIT

An in-vehicle electric component-internal circuit unit has a novel structure that can reduce the number of in-vehicle electric component-side work processes and reduce in-vehicle electric component size. An in-vehicle electric component-internal circuit unit includes: an insulative holder that holds circuit members; a wire harness that includes a coated wire, a circuit-side connection portion that is provided on an end portion on one side of the coated wire, a connector that is provided on an end portion on the other side of the coated wire, and a grommet through which the coated wire passes; a plate wall portion for covering a housing through-hole provided in a housing of an in-vehicle electric component; and a seal member that is provided on a first surface, which is a surface of the plate wall portion to be attached to the housing and that comes into contact with the rim of the housing through-hole.