An optical print head configured to be included in an image forming apparatus, comprising: a light emitting portion in which a plurality of light emitting elements for emitting light for exposing thereto a photosensitive drum included in said image forming apparatus are arranged in a longitudinal direction of said optical print head; a lens array in which a plurality of lenses for concentrating the light, emitted from said plurality of light emitting elements, on a surface of said photosensitive drum are arranged in the longitudinal direction; a holding member for holding said light emitting portion and said lens array; a first opposing portion which is formed integrally with said holding member, said first opposing portion being projected by a predetermined length from said holding member toward an emergent direction of the light with respect to an optical axis direction of said lenses and which opposes a first side wall surface which is a side wall surface of said lens array on one side with respect to a perpendicular direction perpendicular to both the longitudinal direction and the optical axis direction, wherein said first side wall surface is adhesively fixed to said first opposing portion; and a second opposing portion which is formed integrally with said holding member, said second opposing portion being projected by the predetermined length from said holding member toward the emergent direction and which opposes a second side wall surface which is a side wall surface of said lens array on the other side with respect to the perpendicular direction, wherein said second side wall surface is adhesively fixed to said second opposing portion, characterized in that within a range of the predetermined length, each of said first side wall and said second side wall of one end side of said lens array with respect to the longitudinal direction, is exposed from each of one end of said first opposing portion and one end of said second opposing portion with respect to the longitudinal direction, and within a range of the predetermined length, each of said first side wall and said second side wall of the other end side of said lens array with respect to the longitudinal direction, is exposed from each of the other end of said second opposing portion and the other end of said first opposing portion with respect to the longitudinal direction. a light emitting portion in which a plurality of light emitting elements for emitting light for exposing thereto a photosensitive drum included in said image forming apparatus are arranged in a longitudinal direction of said optical print head; a lens array in which a plurality of lenses for concentrating the light, emitted from said plurality of light emitting elements, on a surface of said photosensitive drum are arranged in the longitudinal direction; a holding member for holding said light emitting portion and said lens array; a first opposing portion which is formed integrally with said holding member, said first opposing portion being projected by a predetermined length from said holding member toward an emergent direction of the light with respect to an optical axis direction of said lenses and which opposes a first side wall surface which is a side wall surface of said lens array on one side with respect to a perpendicular direction perpendicular to both the longitudinal direction and the optical axis direction, wherein said first side wall surface is adhesively fixed to said first opposing portion; and a second opposing portion which is formed integrally with said holding member, said second opposing portion being projected by the predetermined length from said holding member toward the emergent direction and which opposes a second side wall surface which is a side wall surface of said lens array on the other side with respect to the perpendicular direction, wherein said second side wall surface is adhesively fixed to said second opposing portion, characterized in that within a range of the predetermined length, each of said first side wall and said second side wall of one end side of said lens array with respect to the longitudinal direction, is exposed from each of one end of said first opposing portion and one end of said second opposing portion with respect to the longitudinal direction, and within a range of the predetermined length, each of said first side wall and said second side wall of the other end side of said lens array with respect to the longitudinal direction, is exposed from each of the other end of said second opposing portion and the other end of said first opposing portion with respect to the longitudinal direction.