A biometric information acquisition apparatus includes: a light guide that guides a light beam through a plurality of light reflective surfaces; and an image pickup unit that receives the light beam output from the light guide and captures a subject image. The light guide includes an input surface that receives the subject image and is provided at a front surface side; a first light reflective surface that is opposed to the input surface and is provided at a back surface side; and a second light reflective surface that extends in a thickness direction of the light guide. A subject image can be acquired within a desired range by employing the light guide, while suppressing an increase in size of the biometric information acquisition apparatus.