Abstract: A bulb holder for decorative lamp includes a main body that is connected to a frame of the lamp for holding a plurality of bulbs and has retaining spaces equally spaced at a lower side thereof, and a tubular connector that includes a lower tube portion that may be differently sized, and a horizontal flange portion. The flange portion is provided along an outer edge with equally spaced teeth corresponding to the retaining spaces on the main body. By aligning the tube portion with a central mounting hole of the main body and turning the tubular connector to move the teeth into the retaining spaces, the tubular connector is detachably connected to the lower side of the main body. By connecting the main body to a tubular connector having a differently sized tube portion, the decorative lamp may be conveniently mounted onto a differently sized post via the tube portion.