Lamp holder

A lamp holder comprising:

• A body provided with a recessed room in its upper portion and a central through hole in the lower portion under said upper portion;
• A helical cylinder fixed in said recessed room of said body for a lamp bulb to screw with, said helical cylinder functioning as one terminal;
• An elastic conductive unit received in said through hole of said body and consisting of a conductive rod and a coil spring, said coil spring fitting around said conductive rod and pushing against upper end of said conductive rod to keep a lower end of said conductive rod separated from a central conductor;
• Said central conductor being of a plate shape and provided at a bottom side of said body, said central conductor fixed at one side of a lower end of said through hole of said body, said central conductor having its outer end fixed with said body and connected with one terminal of power;
• Said conductive rod of said elastic conductive unit normally separated from said central conductor when a lamp bulb is not completely screwed in said helical cylinder of said lamp holder, a contact point of said lamp bulb moved down to contact and push down said conductive rod against the elasticity of said coil spring and finally contact said central conductor to let electricity get through when said lamp bulb is screwed deeply enough in said helical cylinder of said body.