A downrod assembly, connectable to an electric motor of a ceiling fan, and comprising: an adapter subassembly connectable to an electric motor shaft of the electric motor; and a downrod connected with the adapter subassembly and capable of rotating with respect to the electric motor by means of the adapter subassembly, wherein the adapter subassembly comprises: a base seat comprising a base plate and two lateral plates, wherein the base plate and the two lateral plates define a mounting groove, and the base plate is fixedly connectable to the electric motor shaft; and an adapter rotatably connected with the two lateral plates and connected with the downrod, characterized in that the base seat is provided with a connecting column, the adapter is provided with a connecting hole, and a first fixing member passes through the connecting hole to be connected to the connecting column, such that the adapter is fixedly connected with the base seat, and that the adapter comprises a first connecting portion and a second connecting portion connected with each other, the adapter has an overall L shape, and the first connecting portion and the second connecting portion are connected by a circular arc transition part, wherein preferably the second connecting portion is configured as a casing with an open end, the connecting column is inserted into the casing, and the connecting hole is disposed in the casing. an adapter subassembly connectable to an electric motor shaft of the electric motor; and a downrod connected with the adapter subassembly and capable of rotating with respect to the electric motor by means of the adapter subassembly, wherein the adapter subassembly comprises: a base seat comprising a base plate and two lateral plates, wherein the base plate and the two lateral plates define a mounting groove, and the base plate is fixedly connectable to the electric motor shaft; and an adapter rotatably connected with the two lateral plates and connected with the downrod, characterized in that the base seat is provided with a connecting column, the adapter is provided with a connecting hole, and a first fixing member passes through the connecting hole to be connected to the connecting column, such that the adapter is fixedly connected with the base seat, and that the adapter comprises a first connecting portion and a second connecting portion connected with each other, the adapter has an overall L shape, and the first connecting portion and the second connecting portion are connected by a circular arc transition part, wherein preferably the second connecting portion is configured as a casing with an open end, the connecting column is inserted into the casing, and the connecting hole is disposed in the casing. a base seat comprising a base plate and two lateral plates, wherein the base plate and the two lateral plates define a mounting groove, and the base plate is fixedly connectable to the electric motor shaft; and an adapter rotatably connected with the two lateral plates and connected with the downrod, characterized in that the base seat is provided with a connecting column, the adapter is provided with a connecting hole, and a first fixing member passes through the connecting hole to be connected to the connecting column, such that the adapter is fixedly connected with the base seat, and that the adapter comprises a first connecting portion and a second connecting portion connected with each other, the adapter has an overall L shape, and the first connecting portion and the second connecting portion are connected by a circular arc transition part, wherein preferably the second connecting portion is configured as a casing with an open end, the connecting column is inserted into the casing, and the connecting hole is disposed in the casing.