An image reading apparatus includes an optical unit through which a light from a document passes, an image sensor configured to receive the light from the document via the optical unit, and a first holding member configured to hold the optical unit and the image sensor. The first holding member has an opening and a second holding member is fitted in the opening. The optical unit is disposed on the second holding member and the second holding member is positioned with respect to the first holding member with a gap between the first holding member and the second holding member and fixed to the first holding member by an adhesive that fills the gap.

An image reading apparatus includes an optical unit through which a light from a document passes, an image sensor configured to receive the light from the document via the optical unit, and a first holding member configured to hold the optical unit and the image sensor. The first holding member has an opening and a second holding member is fitted in the opening. The optical unit is disposed on the second holding member and the second holding member is positioned with respect to the first holding member with a gap between the first holding member and the second holding member and fixed to the first holding member by an adhesive that fills the gap.

A solid-state imaging device includes: multiple micro lenses, which are disposed in each of a first direction and a second direction orthogonal to the first direction, focus the incident light into the light-receiving surface; with the multiple micro lenses of which the planar shape is a shape including a portion divided by a side extending in the first direction and a side extending in the second direction being disposed arrayed mutually adjacent to each of the first direction and the second direction; and with the multiple micro lenses being formed so that the depth of a groove between micro lenses arrayed in a third direction is deeper than the depth of a groove between micro lenses arrayed in the first direction, and also the curvature of the lens surface in the third direction is higher than the curvature of the lens surface in the first direction.

A solid-state imaging device includes: multiple micro lenses, which are disposed in each of a first direction and a second direction orthogonal to the first direction, focus the incident light into the light-receiving surface; with the multiple micro lenses of which the planar shape is a shape including a portion divided by a side extending in the first direction and a side extending in the second direction being disposed arrayed mutually adjacent to each of the first direction and the second direction; and with the multiple micro lenses being formed so that the depth of a groove between micro lenses arrayed in a third direction is deeper than the depth of a groove between micro lenses arrayed in the first direction, and also the curvature of the lens surface in the third direction is higher than the curvature of the lens surface in the first direction.