<p>In an optical beam transmission adjusting mechanism (110) installed in an optical pickup device, the positions where a first transmission element (111) with a first transmittance and a second transmission element (112) with a second transmittance higher than the first transmittance are placed are changed by a rotatingly driving part (105) so that the first and second transmission elements can selectively output an optical beam with a first optical power and an optical beam with a second optical power. Since the transmission element on the optical beam non-transmission side is disposed aslant relative to the optical axis, it does not block the diverging optical beam.</p>
