| 摘要 |
PROBLEM TO BE SOLVED: To prevent loosening of a lamp fastened to a socket.SOLUTION: An LED lamp 200 includes a mouth piece 3 provided at a cylindrical part 230, and the mouth piece 3 is fastened to a socket 290. The LED lamp 200 includes a ring shaped loosening prevention member 260 provided at an outer periphery of the cylindrical part 230. The loosening prevention member 260 includes a socket side contact surface 297 which contacts with a tip periphery part 292A of a connection opening 292 of the socket 290. The socket side contact surface 297 includes a connection wall part 303 which prevents rotations of the LED lamp 200. |
