Camera apparatus and camera module

A camera apparatus comprising:

• a camera case that is fixed to a windshield of a vehicle from within a cabin of the vehicle;
• and
• a camera module that includes an optical unit and a camera substrate, and is fixed to the camera case, the optical unit including a lens, and the camera substrate including an image sensor and being fixed to an end portion of the optical unit,
• the optical unit including a lens barrel portion and a base portion, the lens barrel portion holding the lens therein, and the base portion having a reference surface that serves as a reference for positioning when the camera module is fixed to the camera case and to which the lens barrel portion is fixed so as to have a fixed positional relationship,
• the camera substrate being fixed to the optical unit in a position in which an optical axis of the lens passes through a center of a light receiving surface of the image sensor and is perpendicular to the light receiving surface of the image sensor.