Disclosed is a socket for a wedge bulb to maintain excellent grounding performance despite vibration encountered in use. The wedge bulb includes a light emitting element and a connector protruding from a lower end of the light emitting element and provided at each of a front surface and a rear surface thereof with a pair of parallel elastic terminals. The socket includes an elastic supporting terminal unit provided at an inner wall surface of a coupling recess defined in the socket and serving to elastically support the connector inserted into the coupling recess while achieving electrical connection with the electric terminals. Any one of each pair of the electric terminals is pressed and supported by the elastic supporting terminal unit at a different height from the neighboring electric terminal provided at the same surface of the connector and the other electric terminals provided at the opposite surface of the connector.