An electronic component unit includes an electronic component including an electronic component main body, a holding member with a plate-shaped base holding the electronic component main body, and a terminal electrically connected to the electronic component main body; a housing member including a housing space that houses the electronic component with a first housing chamber for housing the electronic component main body and a second housing chamber for housing the terminal of the electronic component; and a counterpart terminal fitted to the second housing chamber and electrically connected to the terminal when the electronic component is housed in the housing space. The terminal is disposed inside of a virtual space formed by projecting the base in the inserting direction of the electronic component toward the housing space. The base is used as a lid to cover an opening of the housing space to which the electronic component is inserted.