A lighting device comprising: a globe having an opening at one end and a hollow inside; a base housed in the globe; a light source including at least one LED disposed on the base, the light source being housed in the globe; a light guide member facing a light-emitting surface of the light source, the light guide member being extended in an opposite direction from the base, the light guide member having optical transparency, the light guide member being housed in the globe; a columnar support configured to support the base, the columnar support being housed in the globe and being located on the opposite side from the light source to the base and the light guide member; a globe connector connected to the columnar support at the one end of the globe; a cap connector connected to the globe connector; a bayonet cap configured to supply electrical power to the light source, the bayonet cap being connected to the cap connector; and a wiring line configured to electrically connect the bayonet cap and the light source, characterized in that the lighting device further comprises: a scatterer disposed at an end portion of the light guide member opposite to the light source side; a cover configured to cover a portion of a side face of the light guide member, the portion being located from the base to a position between the light-emitting surface and the scatterer, and a radiation layer configured to radiate heat, the radiation layer being disposed on a surface of the column support, wherein the light guide member is a light guide pillar, formed with a base portion and a top end portion, and these portions are joined to form a hollow inside, the scatterer is inserted in the hollow, and an inner surface of the hollow is subjected to coating or blast finishing, the cover is further used on the side surface of the light guide pillar so as to cover part of the base portion, the cover has material with an excellent heat conductivity, and the cover is housed within 1/2 of the light distribution angle of the light guide member. a globe having an opening at one end and a hollow inside; a base housed in the globe; a light source including at least one LED disposed on the base, the light source being housed in the globe; a light guide member facing a light-emitting surface of the light source, the light guide member being extended in an opposite direction from the base, the light guide member having optical transparency, the light guide member being housed in the globe; a columnar support configured to support the base, the columnar support being housed in the globe and being located on the opposite side from the light source to the base and the light guide member; a globe connector connected to the columnar support at the one end of the globe; a cap connector connected to the globe connector; a bayonet cap configured to supply electrical power to the light source, the bayonet cap being connected to the cap connector; and a wiring line configured to electrically connect the bayonet cap and the light source, characterized in that the lighting device further comprises: a scatterer disposed at an end portion of the light guide member opposite to the light source side; a cover configured to cover a portion of a side face of the light guide member, the portion being located from the base to a position between the light-emitting surface and the scatterer, and a radiation layer configured to radiate heat, the radiation layer being disposed on a surface of the column support, a scatterer disposed at an end portion of the light guide member opposite to the light source side; a cover configured to cover a portion of a side face of the light guide member, the portion being located from the base to a position between the light-emitting surface and the scatterer, and a radiation layer configured to radiate heat, the radiation layer being disposed on a surface of the column support, wherein the light guide member is a light guide pillar, formed with a base portion and a top end portion, and these portions are joined to form a hollow inside, the scatterer is inserted in the hollow, and an inner surface of the hollow is subjected to coating or blast finishing, the cover is further used on the side surface of the light guide pillar so as to cover part of the base portion, the cover has material with an excellent heat conductivity, and the cover is housed within 1/2 of the light distribution angle of the light guide member.