Abstract: LED illumination apparatus having a pipe shape. An apparatus includes: an inner tube formed of light diffusion Polycarbonate; an outer tube formed of a transparent or semitransparent material and fitted to an outer surface of the inner tube; a coupling member having a cylindrical shape and a substrate seating part that has a flange shape and disposed at the center thereof; an LED substrate having a circular plate shape, fixedly mounted on the substrate seating part, and including LEDs that emit light toward the inner tube and an inner circumferential surface of the outer tube; and a finishing member having a circular plate shape with a hole and an extension part that has a certain height and protrudes in a vertical direction from an inner circumferential surface of the hole.