The invention relates to a bulb assembly including a bulb holder and a socket, wherein the holder is provided with an elastic rod having an inclined bottom end. The socket is provided with a side slot having a bottom. The holder can insert into the socket and let the inclined end expose from the slot to engage both firmly. When the inclined end is pressed and moved inward, an upward force can be produced to push the holder moving upward a distance for separating from the socket in ease.