The present technology relates to a camera module, a production method, and an electronic device that can prevent reduction of optical module positioning accuracy or heat dissipation performance. An image pickup element is joined on one face of a flexible board so that a light receiving surface of the image pickup element is exposed through an opening of the flexible board, and an optical module is joined on an other face of the flexible board. A reinforcing member is joined on the one face of the flexible board at a circumference of the image pickup element and reinforces a joining part of the flexible board where the optical module is joined. The reinforcing member is joined so as to face an area including at least a part of the joining part and is formed so that a part of the circumference of the image pickup element is kept open.