There is provided an inexpensive optical pickup device that is capable of accurately detecting light quantities of output laser beams on occasion of at least either of reproduction and recording on an information recording medium. A beam from a first light source 1 which beam does not pass through a wavelength selection film 6 of a light separation element 7 is reflected by a first reflection film 10 in a direction to an optical monitor 5. A beam from a second light source 2 which beam does not pass through the wavelength selection film 6 of the light separation element 7 is reflected by a second reflection film 11 in a direction to the optical monitor 5.