Hybrid drive device with an internal combustion engine (11a; 11b), with a planetary gearbox (13a; 13b), with a first spur gear sub-unit (14a; 14b) and with a second spur gear sub-unit (15a; 15b), wherein the first spur gear sub-unit (14a; 14b) has a first input shaft (EW1a; EW1b) and the second spur gear sub-unit (15a; 15b) has a second input shaft (EW2a; EW2b) arranged coaxial with the input shaft (EW1a; EW1b), with a first layshaft (V1a; V1b) arranged parallel to the first and to the second input shaft (EW1a; EW1b; EW1a; EW1b), wherein the first spur gear sub-unit (14a; 14b) and the second spur gear sub-unit (15a; 15b) are directly connected to the planetary gearbox (13a; 13b), and wherein the planetary gearbox (13a; 13b) has two planetary gear sets (P1a, P2a; P1b, P2b), wherein a first planetary gear set (P1a; P1b) of the planetary gearbox (13a; 13b) has a ring gear (P11a; P11b), a first planetary carrier (P12a; P12b) and a first sun gear (P13a; P13b), wherein there is provided, in addition to the first layshaft (V1a; V1b), a joint layshaft (V3a; V3b) having precisely one fixed gear (V31a; V31b) and precisely one idler gear (V32a; V32b), wherein the fixed gear (V31a; V31b) permanently meshes with a gear of the first spur gear sub-unit (14a; 14b) and the idler gear (V32a; V32b) permanently meshes with a gear of the second spur gear sub-unit (15a; 15b),, wherein a first switching unit (25a; 25b) is provided to connect the idler gear (V32a; V32b) of the joint layshaft (V3a; V3b) non-rotatably to the fixed gear (V31a; V31b) of the joint layshaft (V3a; V3b), characterised in that an electric machine (12a; 12b) is provided, which has a rotor (17a; 17b) and is directly connected to the planetary gearbox (13a; 13b), and in that the internal combustion engine (11a; 11b) is connected to the planetary gearbox (13a; 13b) via a decoupler (16a; 16b), wherein the fixed gear (V31a; V31b) of the joint layshaft (V3a; V3b) permanently meshes with a fixed gear (EW24a; EW24b) of the second input shaft (EW2a; EW2b) and the idler gear (V32a; V32b) of the joint layshaft (V3a; V3b) permanently meshes with a fixed gear (EW12a; EW12b) of the first input shaft (EW1a; EW1b). with a first layshaft (V1a; V1b) arranged parallel to the first and to the second input shaft (EW1a; EW1b; EW1a; EW1b), wherein the first spur gear sub-unit (14a; 14b) and the second spur gear sub-unit (15a; 15b) are directly connected to the planetary gearbox (13a; 13b), and wherein the planetary gearbox (13a; 13b) has two planetary gear sets (P1a, P2a; P1b, P2b), wherein a first planetary gear set (P1a; P1b) of the planetary gearbox (13a; 13b) has a ring gear (P11a; P11b), a first planetary carrier (P12a; P12b) and a first sun gear (P13a; P13b), wherein there is provided, in addition to the first layshaft (V1a; V1b), a joint layshaft (V3a; V3b) having precisely one fixed gear (V31a; V31b) and precisely one idler gear (V32a; V32b), wherein the fixed gear (V31a; V31b) permanently meshes with a gear of the first spur gear sub-unit (14a; 14b) and the idler gear (V32a; V32b) permanently meshes with a gear of the second spur gear sub-unit (15a; 15b),, wherein a first switching unit (25a; 25b) is provided to connect the idler gear (V32a; V32b) of the joint layshaft (V3a; V3b) non-rotatably to the fixed gear (V31a; V31b) of the joint layshaft (V3a; V3b), characterised in that an electric machine (12a; 12b) is provided, which has a rotor (17a; 17b) and is directly connected to the planetary gearbox (13a; 13b), and in that the internal combustion engine (11a; 11b) is connected to the planetary gearbox (13a; 13b) via a decoupler (16a; 16b), wherein the fixed gear (V31a; V31b) of the joint layshaft (V3a; V3b) permanently meshes with a fixed gear (EW24a; EW24b) of the second input shaft (EW2a; EW2b) and the idler gear (V32a; V32b) of the joint layshaft (V3a; V3b) permanently meshes with a fixed gear (EW12a; EW12b) of the first input shaft (EW1a; EW1b).