The present invention discloses an organic compound represented by the following formula (1), the organic EL device employing the organic compound as light emitting host of emitting lay and/or an electron transporting layer, and/or a hole blocking layer, and/or a delayed fluorescence material of emitting layer can display good performance. wherein A1 and A2 are acceptor, m, n, L1, L2, Y1, Y2 and X1 to X5 are the same definition as described in the present invention.