An optical waveguide module provides light intensity detection is comprised of a light emitting portion, a substrate and a clad formed over the substrate wherein a first core and a second core are covered with the clad, the first and second cores being formed of a material having a higher refractive index than that of the clad. A first reflection surface is formed at an incident side end portion of the first core for reflecting light emitted from a light emitting portion in the guiding direction of the first core and a second reflection surface is formed as an incident side end portion of the second core for reflecting light emitted from the light emitting portion in the guiding direction of the second core. A light receiving portion receives and detects an amount of light in order to control the intensity of the emitted light.