A circuit apparatus includes: a stacked body; and a plurality of terminals. The stacked body includes a plurality of layers. A plurality of holes that extend through the plurality of layers are formed in the stacked body. Each of the plurality of layers includes a connection member that is formed of a conductor. The connection member includes: a plurality of connection portions that are provided at positions corresponding to the plurality of holes; and a joining portion that connects the plurality of connection portions to each other. The plurality of terminals include a plurality of types of terminals that correspond to the plurality of layers. Each of the plurality of types of terminals can be selectively connected to the connection portion of a corresponding one of the plurality of layers by being inserted into a predetermined one of the plurality of holes.