A structure which holds a lens by fitting a lens holding member holding a lens into an outer cylindrical member. In the structure, a biasing mechanism is provided to bias the lens holding member, located within the outer cylindrical member, forward or backward in an optical axis direction. A plurality of engaging nails are arranged on one of circumferential surfaces of the lens holding member and the outer cylindrical member at substantially equal angular intervals circumferentially. A plurality of fixing holes arranged on the other of the circumferential surfaces of the lens holding member and the outer cylindrical member at substantially equal angular intervals circumferentially to be respectively engaged with the engaging nails to retain the lens holding member relative to the outer cylindrical member against a biasing force of the biasing mechanism. A tilt correcting plate is selectively mountable between one of the engaging nails and mating one of the fixing hole to tilt an axis of the lens holding member relative to an axis of the outer cylindrical member.