In-vehicle electrical component circuit unit

An in-vehicle electrical component circuit unit comprising:

• an electrically insulative holding body configured to hold a circuit member;
• a plate wall portion configured to cover a casing through hole provided in a casing of an in-vehicle electrical component;
• a connector including a connection member that protrudes toward two sides in a plate thickness direction of the plate wall portion while held by the plate wall portion;
• and
• an annular sealing member that is provided on a first surface, which is a surface of the plate wall portion that is to be attached to the casing, and is configured to come into contact with a peripheral edge of the casing through hole,
• wherein a portion of the connection member that protrudes on a first surface side corresponding to the first surface of the plate wall portion includes a circuit-side connection portion,
• the circuit-side connection portion is detachably connectable to the circuit member,
• the circuit-side connection portion of the connection member is inserted into the casing through hole from outside the casing and connected to the circuit member, and the sealing member of the wall plate portion comes into contact with the peripheral edge of the casing through hole from outside of the casing,
• the in-vehicle electrical component circuit unit further comprises a base plate portion configured to be placed onto and fixed to the holding body,
• the base plate portion is made of a material with higher heat conductivity than the holding body,
• the base plate portion is provided with a support leg portion that protrudes downward from the base plate portion, and
• a protruding height of the support leg portion is set to adjust a height position of the plate wall portion relative to the casing through hole.