Abstract: Optical head 1 has heat sink 6. This heat sink 6 has front overhang section 16 (contact part), the 2nd front drooping sections 17a (contact part) and 17b (contact part), the 1st side drooping section 18, side overhang section 19 (contact part), and the 2nd side drooping sections 20a (contact part) and 20b (contact part) which carry out field contact in laser diodes 4 and 5 and laser holders 12 and 13. Also this heat sink 6 has body part 14 which intervenes between an optical disc and housing 3.

Abstract: Even when binder repeats expansion and contraction by the time progress after a reliability test or mounting, and change of circumference environment, in the offered optical head, a gap of optical axis and exfoliation of binder are not generated. The optical head indicated has the housing in which the optical detector holder-board 1 holding the optical detector 3 which detects the catoptric light beam reflected in respect of information record of an optical disc is attached. With this optical head, the optical detector holder-board 1 has through-holes 1a and 1b having the flat portions 11 and 12 inside, and the supports 2a and 2b having the flat portions 15 and 16 outside are formed on housing. The optical detector holder-board 1 is inserted in supports 2a and 2b by the through-holes 1a and 1b, and the binder 4 and 5 is filled up into the space 31 or the space 32, and is fixed.