An imager includes: a fixing member as defined herein; a sealing member as defined herein; a circuit board as defined herein; and a conductive member as defined herein, in a state of being viewed from a direction perpendicular to a light receiving surface of the imaging sensor chip, an outer edge of a region where the conductive member is disposed overlaps the wall portion of the fixing member, and a distance between a position overlapping the outer edge in the wall portion and an end of the wall portion on a side of the concave portion is 20% or more of a width of the wall portion in a direction parallel to the light receiving surface.