accordingly only the cd laser power control unit lpcd_ 1 functions and thus the laser power of the laser diode ld 1 is appropriately controlled on the other hand in the case where the dvd drive is used i e in the case where the laser diode ld 2 emits light the controller 100 b turns off the offset adjuster 1 variable gain circuit 2 sample hold circuit 3 and operational amplifier 4 of the cd laser power control unit lpcd_ 1 accordingly only the dvd laser power control unit lpdvd_ 2 functions and thus the laser power of the laser diode ld 2 is appropriately controlled referring to fig3 a laser power control apparatus according to the present embodiment will be described a laser power control apparatus lpc 3 is a modified version of the laser power control apparatus lpc 2 shown in fig2 in which the laser power control unit lpdvd_ 2 is replaced with a dvd laser power control unit lpdvd_ 3 and the controller 100 b is replaced with a controller 100 c the dvd laser power control unit lpdvd_ 3 is different from the dvd laser power control unit lpdvd_ 2 in that an offset adjuster 18 is additionally provided between a variable gain circuit 9 and a junction 11 through an adder 22 by using the offset adjuster 18 the sensitivity to dvd laser light ld applied from a laser diode ld 2 can be more accurately adjusted than the laser power control apparatus lpc 2.