An apparatus for fixing a half mirror of an optical pickup includes a pair of
left-hand-side and right-hand-side presser plate portions 12b, which
are respectively extended from both side edge portions of the fastening device
body 12a and caused to elastically abut against a surface of the
half mirror 3. This apparatus further comprises a pair of left-hand-side
and right-hand-side engaging claw portions 12c respectively bent
from both side edge portions of the fastening device body 12a in
a direction opposite to a direction, wherein the left-hand-side and right-hand-side
presser plate portions 12b are extended, to thereby engage with the
inner surface 5c, and a catch piece portion 12d bent
from a central portion of the fastening device body 12a and extended
to a peripheral edge of the opening portion 2a of the light passing
hole 2.
