A pickup apparatus 1 is directed to an apparatus for optically reading-out information on a disk 3 arranged in a disk player, and comprises a pickup 11, an LD 13, a half mirror 15, a photo detector 17, and a pickup frame 19. The 11 is for irradiating a light on the 3 and for receiving the light reflected from the 3. The 13 is for transmitting the light to the 11. The 15 is a plate shape member for reflecting the light outputted from the 13 and for transmitting the light to the 11, that the light from the 11 permeate. The light permeating through the 15 incidents on the 17. The 11, the 13, and the 17 are fixed on the 19 at predetermined positions. A side part of the 15 is fixed to the 19 at three points by using an adhesive agent.