An optical measurement apparatus has a light source section, a light receiving section, and a light guiding section. The light source section has a light emitting surface that emits light. The light receiving section has a light receiving surface that receives the light emitted by the emitting surface of the light source to be incident into a body through a surface of the body and which is emitted out of the body after propagating inside the body, the receiving surface facing a direction orthogonal to the emitting surface of the light source, and the receiving section outputting a signal indicative of an amount of the light received by the receiving surface. The light guiding section is provided on a path of the light emitted from the emitting surface and received by the receiving surface to change a traveling direction of the light.
