A composite optical component and its manufacturing method are disclosed. A
holding member or an optical functional device is subjected to elastic
deformation, with both of them fixed together, and the optical functional
device is subjected to plastic deformation by heating to reduce stress
between two components in such a way that the holding member and optical
functional device will be slide-fitted with each other; sliding resistance
between the optical functional device and enclosure per "b" in
longitudinal direction of the optical component will be
F.ltoreq.a/b.times.S.times.E; or the optical functional device and holding
member will be slide-fit by formation of one integral body in the mold,
thereby preventing thermal distortion and distortion of the optical
functional device due to recovery of elastic deformation of a reinforcing
member, with the result that manufacturing costs can be reduced while a
high degree of straightness and high surface precision are maintained.
