A drive control device for a hybrid vehicle provided with: a differential device (14, 16; 14, 16') which includes a first differential mechanism and a second differential mechanism (16; 16') and which has four rotary elements (S1, C1/C2, R1/R2, S2; S1, C1/R2', R1/ C2', S2); and an engine, a first electric motor, a second electric motor and an output rotary member which are respectively connected to said four rotary elements (S1, C1/C2, R1/R2, S2; S1, C1/R2', R1/ C2', S2), and wherein one (C1, C2; C1, R2') of said four rotary elements is constituted by a rotary component (C1; C1) of said first differential mechanism and a rotary component (C2; R2') of said second differential mechanism (16; 16') which are selectively connected to each other through a clutch, and one (C2; R2') of the rotary components of said first and second differential mechanisms (16, 16') which are selectively connected to each other through said clutch is selectively fixed to a stationary member through a brake, said hybrid vehicle being selectively placed in a plurality of drive modes according to respective combinations of engaged and released states of said clutch and said brake, said drive control device characterized by comprising: a drive mode determining portion configured to switch said driving mode on the basis of a temperature condition of a drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) of the hybrid vehicle, wherein said drive mode determining portion is adapted for switching said drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) to a drive mode which is established to assign the required work to the first electric motor and the second electric motor in which said clutch is placed in the engaged state, when a temperature of the drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) has become equal to or higher than a predetermined threshold value. a differential device (14, 16; 14, 16') which includes a first differential mechanism and a second differential mechanism (16; 16') and which has four rotary elements (S1, C1/C2, R1/R2, S2; S1, C1/R2', R1/ C2', S2); and an engine, a first electric motor, a second electric motor and an output rotary member which are respectively connected to said four rotary elements (S1, C1/C2, R1/R2, S2; S1, C1/R2', R1/ C2', S2), and wherein one (C1, C2; C1, R2') of said four rotary elements is constituted by a rotary component (C1; C1) of said first differential mechanism and a rotary component (C2; R2') of said second differential mechanism (16; 16') which are selectively connected to each other through a clutch, and one (C2; R2') of the rotary components of said first and second differential mechanisms (16, 16') which are selectively connected to each other through said clutch is selectively fixed to a stationary member through a brake, said hybrid vehicle being selectively placed in a plurality of drive modes according to respective combinations of engaged and released states of said clutch and said brake, said drive control device characterized by comprising: a drive mode determining portion configured to switch said driving mode on the basis of a temperature condition of a drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) of the hybrid vehicle, wherein said drive mode determining portion is adapted for switching said drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) to a drive mode which is established to assign the required work to the first electric motor and the second electric motor in which said clutch is placed in the engaged state, when a temperature of the drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) has become equal to or higher than a predetermined threshold value. a drive mode determining portion configured to switch said driving mode on the basis of a temperature condition of a drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) of the hybrid vehicle, wherein said drive mode determining portion is adapted for switching said drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) to a drive mode which is established to assign the required work to the first electric motor and the second electric motor in which said clutch is placed in the engaged state, when a temperature of the drive system (10; 100; 110; 120; 130; 140; 150; 160; 170; 180) has become equal to or higher than a predetermined threshold value.