NOVELTY - An organic electroluminescent element has organic layer (20) including light emitting layer (23), provided between anode (11) and cathode (31). The organic layer has laminated structure of layer (a) containing thiophene derivative and organic acid, and layer (b) containing nitrogen-containing compound (I) and fluorene compound (II).    USE - Organic electroluminescent element is used for color display device (claimed). Uses include but are not limited to organic solar cell, organic transistor, organic memory, battery and recording device, vehicle-mounted audio, cathode ray tube, and liquid crystal display for mobile telephone, camcorder and television.    ADVANTAGE - The organic electroluminescent element has excellent durability, and emits light having high intensity for long period of time.    DETAILED DESCRIPTION - An organic electroluminescent element has organic layer including light emitting layer, provided between anode and cathode. The organic layer has laminated structure of layer (a) containing thiophene derivative and organic acid, and layer (b) containing nitrogen-containing compound of formula (I) and fluorene compound of formula (II).    R1,R2,Y1,Y2=aromatic carboxylic or aromatic heterocyclic (both optionally substituted);    R3-R10=H, halo, alkyl, aralkyl, alkenyl, cyano, amino, acyl, alkoxycarbonyl, carboxy, alkoxy, aryloxy, alkylsulfonyl, hydroxy, amide, aromatic carbocyclic or aromatic heterocyclic (all optionally substituted);    L1=coupling group formed by optionally substituted bivalent aromatic heterocyclic or bivalent aromatic carbocyclic;    X1=N-carbazoyl, N-phenoxazinyl or N-phenothiazinyl (all optionally substituted);    X2=N-carbazoyl, N-phenoxazinyl, N-phenothiazinyl or -N(Y1)(Y2)- (all optionally substituted);    R11,R12=H, alkyl, aromatic carbocyclic, aromatic heterocyclic or aralkyl (all optionally substituted);and    R13,R14=H, halo, alkyl, alkoxy, aromatic carbocyclic or aromatic heterocyclic (all optionally substituted).    DESCRIPTION OF DRAWING(S) - The drawing shows sectional view of the organic electroluminescent element.    Substrate (10)    Anode (11)    Organic layer (20)    Light emitting layer (23)    Cathode (31)