A structure for assembling a bulb holder with an outer shade, including an outer shade and a bulb holder. The outer shade is formed with a central through hole through which a hollow tube is passed. The hollow tube has an outer connecting section on which a locating member is disposed. The bulb holder includes a fixing seat and a base seat for connecting with a bulb. Several support posts axially extend from a circumference of the fixing seat. Each support post has a free end from which a stopper section radially extends. The fixing seat is formed with an inner connecting section with which the outer connecting section of the hollow tube is connected for locating the outer shade between the fixing seat and the locating member. The base seat has an open end distal from the fixing seat. A circumferential wall of the open end of the base seat is formed with multiple recesses in which the stopper sections of the fixing seat are inlaid and located. The bulb holder can be axially moved and conveniently assembled with or disassembled from the outer shade.