FIG. 7 is a diagram for describing a channel formed in a first case body (schematic view of a cross-section of the first case body taken along a plane that extends along the surface direction).

FIG. 8 is a diagram showing an enlarged view of a portion where a first channel portion and a second channel portion are connected.

FIG. 9 is an exterior view of a substrate unit that is one example of an object housed in the case body according to the embodiment of the present invention.

FIG. 10 is a diagram showing an enlarged view of a portion on which an electronic component of the substrate unit (one of the terminals being for electrical connection to a conductive member) is mounted (showing the substrate and the conductive member fixed thereto).

FIG. 11 is a cross-sectional view of the portion on which the electronic component of the substrate unit (one of the terminals being for electrical connection to the conductive member) is mounted (showing the substrate and the conductive member fixed thereto), and is taken along a plane that passes through a drain terminal and a source terminal.