Abstract: An imaging device includes: an electronic circuit unit that includes an imaging element and a first connection terminal; a case that accommodates the electronic circuit unit and has an opening so as to expose the first connection terminal therefrom; a lid-shaped body that causes a second connection terminal to be connected to the first connection terminal when the lid-shaped body abuts against the case. The lid-shaped body is loose-fitted in a moveable manner with respect to the case in a direction of an abutting surface that is substantially orthogonal to center axes of the first connection terminal and the second connection terminal. The lid-shaped body is fixed at an arbitrary position within a movable range with respect to the case in the abutting surface direction in a state in which the center axes of the first connection terminal and the second connection terminal are substantially aligned with each other.