A frame with segments that are in flush with each other is disclosed. The frame of the present invention comprises a plurality of segments, a plurality of outer retaining units and a plurality of inner retaining units. The segments are connected together to form a frame. Each outer retaining unit is disposed on the rear outer side of the juncture of each pair of neighboring segments. Each inner retaining unit is disposed on the rear inner side of the juncture of each pair of neighboring segments. In this manner, each pair of neighboring segments may be tightly joined together and the segments of the frame may be in flush with each other.