In one embodiment, an LED light bulb includes an LED module, a base part on which the LED module is disposed, and a globe attached to the base part. The LED module includes an ultraviolet to violet light-emitting LED chip mounted on a surface of a substrate. The globe has a shape in which a cross section in a direction in parallel to the surface of the substrate is circular. A phosphor screen emitting white light by absorbing the ultraviolet to violet light emitted from the LED chip is provided on an inner surface of the globe. The globe has a shape in which a diameter D1 at an attaching part to the base part is smaller than a diameter D2 at a maximum portion of the cross section.