An organic electroluminescent device comprising an anode , a cathode , and at least one organic layer including a light emitting layer between the anode and the cathode , the light emitting layer containing a second organic compound and a third organic compound, wherein the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, characterized in that the light emitting layer further contains a first organic compound, the compounds satisfy the following expression (A): E S 1 A > E S 1 B > E S 1 C wherein E S1 (A) represents a lowest singlet excitation energy level of the first organic compound; E S1 (B) represents a lowest singlet excitation energy level of the second organic compound; and E S1 (C) represents a lowest singlet excitation energy level of the third organic compound, and at least one of [I] and [II] below is satisfied: [I] the second organic compound is contained in the light emitting layer in an amount of from 10% to 50% by weight, and [II] one of the following conditions (i) to (iv) is satisfied: (i) the light emitting material is green light emitting material and the device emits green light, (ii) the light emitting material is red light emitting material and the device emits red light, (iii) the light emitting material is blue light emitting material and the device emits blue light, (iv) the light emitting material is yellow light emitting material and the device emits yellow light. the light emitting layer containing a second organic compound and a third organic compound, wherein the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, characterized in that the light emitting layer further contains a first organic compound, the compounds satisfy the following expression (A): E S 1 A > E S 1 B > E S 1 C wherein E S1 (A) represents a lowest singlet excitation energy level of the first organic compound; E S1 (B) represents a lowest singlet excitation energy level of the second organic compound; and E S1 (C) represents a lowest singlet excitation energy level of the third organic compound, and at least one of [I] and [II] below is satisfied: [I] the second organic compound is contained in the light emitting layer in an amount of from 10% to 50% by weight, and [II] one of the following conditions (i) to (iv) is satisfied: (i) the light emitting material is green light emitting material and the device emits green light, (ii) the light emitting material is red light emitting material and the device emits red light, (iii) the light emitting material is blue light emitting material and the device emits blue light, (iv) the light emitting material is yellow light emitting material and the device emits yellow light. [I] the second organic compound is contained in the light emitting layer in an amount of from 10% to 50% by weight, and [II] one of the following conditions (i) to (iv) is satisfied: (i) the light emitting material is green light emitting material and the device emits green light, (ii) the light emitting material is red light emitting material and the device emits red light, (iii) the light emitting material is blue light emitting material and the device emits blue light, (iv) the light emitting material is yellow light emitting material and the device emits yellow light. (i) the light emitting material is green light emitting material and the device emits green light, (ii) the light emitting material is red light emitting material and the device emits red light, (iii) the light emitting material is blue light emitting material and the device emits blue light, (iv) the light emitting material is yellow light emitting material and the device emits yellow light. <EOS>