An in-wheel electric motor for a vehicle, the in-wheel electric motor comprising: a stator with at a vehicle side an elongated connector member, a cylindrical hollow stator body connected to the connector member with a central axis which corresponds to the electric motor rotation axis and on an outer surface of the stator body equipped with stator windings; a cylindrical rotor body coaxially enclosing the stator and rotatable around an electric motor rotation axis; a cooling jacket that is situated at the perimeter of the cylindrical hollow stator body and arranged for cooling the stator windings; a power electronics device arranged within the hollow stator body and adapted for powering the stator windings; wherein the connector member is provided with a first opening of a feed channel for liquid coolant and a second opening of a return channel for liquid coolant, each of the feed and return channels (92, 93) being parallel to the electric motor rotation axis; wherein the electric motor comprises an internal cooling circuitry with a feed connector and a return connector for liquid coolant, with the feed connector arranged for liquid tight coupling to the first opening of the feed channel and the return connector arranged for liquid tight coupling to the second opening of the return channel, and wherein the internal cooling circuitrty comprises a coolant supply channel (45A - 45E) that extends from the feed connector through first the power electronics device and subsequently to the cooling jacket and from there to the return connector, wherein the feed connector is arranged on an inlet of the coolant supply channel into the power electronics device, and the return connector is arranged on an outlet of the coolant supply channel (45A-45E) from the cooling jacket. a stator with at a vehicle side an elongated connector member, a cylindrical hollow stator body connected to the connector member with a central axis which corresponds to the electric motor rotation axis and on an outer surface of the stator body equipped with stator windings; a cylindrical rotor body coaxially enclosing the stator and rotatable around an electric motor rotation axis; a cooling jacket that is situated at the perimeter of the cylindrical hollow stator body and arranged for cooling the stator windings; a power electronics device arranged within the hollow stator body and adapted for powering the stator windings; wherein the connector member is provided with a first opening of a feed channel for liquid coolant and a second opening of a return channel for liquid coolant, each of the feed and return channels (92, 93) being parallel to the electric motor rotation axis; wherein the electric motor comprises an internal cooling circuitry with a feed connector and a return connector for liquid coolant, with the feed connector arranged for liquid tight coupling to the first opening of the feed channel and the return connector arranged for liquid tight coupling to the second opening of the return channel, and wherein the internal cooling circuitrty comprises a coolant supply channel (45A - 45E) that extends from the feed connector through first the power electronics device and subsequently to the cooling jacket and from there to the return connector, wherein the feed connector is arranged on an inlet of the coolant supply channel into the power electronics device, and the return connector is arranged on an outlet of the coolant supply channel (45A-45E) from the cooling jacket.