An optical module comprises: a surface-type optical element having at least one of a light emitting face and a light receiving face on the back of a mounting face; an optical waveguide for transmitting light in the direction of a normal line of the mounting face; and a mounting portion having an element positioning portion for positioning the surface-type optical element and an optical waveguide positioning portion for positioning the optical waveguide, the mounting portion being mounted with the surface-type optical element and the optical waveguide.