In-vehicle-component circuit unit

An in-vehicle-component circuit unit configured to be housed in a casing of an in-vehicle component, comprising:

• a circuit constituent member;
• an insulating case accommodating the circuit constituent member;
• a connection bus bar accommodated in the case and including an internal connection portion to be conductively connected to a circuit-side connection portion provided in the circuit constituent member, and an external connection portion to be conductively connected to a connector-side connection portion of a connector provided on the casing;
• a first window portion provided in the case and disposed facing the internal connection portion of the connection bus bar and a first bolt insertion hole provided in the internal connection portion;
• and
• a second window portion provided in the case and disposed facing the external connection portion of the connection bus bar and a second bolt insertion hole provided in the external connection portion,
• wherein the first bolt insertion hole and the second bolt insertion hole are each sized to include a tolerance absorbing gap extending in a tolerance absorbing direction,
• the connection bus bar is accommodated so as to be displaceable relative to the case in the tolerance absorbing direction,
• the first window portion is open with a size that enables a bolt fastening operation to be performed from an exterior of the case to the circuit-side connection portion of the internal connection portion through the first window portion, and
• the second window portion is open with a size that enables a bolt fastening operation to be performed from the exterior of the case to the connector-side connection portion of the external connection portion through the second window portion.