A vehicle comprising an electric motor for wheel driving and a two-speed mode transmission (4, 104) that is disposed along an output axis of the electric motor, the two-speed mode transmission comprising: a planetary gear mechanism which comprises three rotational elements (16, 18, 20; 16, 18, 120) including a carrier pivotally supporting plural pinions and including plural gears (16, 18) which have a different tooth number and engage with said pinions, and said planetary gear mechanism comprises a first speed mode in which a first rotational element (20, 120) selected from said three rotational elements (16, 18, 20; 16, 18, 120) is fixed to a housing side and power transmission is performed by using a gear ratio whose value is different from 1.0 and which is obtained between a second rotational element and a third rotational element, and a second speed mode in which said power transmission is performed by using a gear ratio whose value is 1.0 and which is obtained by said first rotational element being fixed to a housing side and by inputting rotation of the output axis of the electric motor to one of said second rotational element and said third rotational element, and outputting said rotation from said one rotational element, or by not fixing said first rotational element to said housing side and integrally rotating one of said second rotational element and said third rotational element with said first rotational element; a dog clutch (28; 128) which may be coupled with said second rotational element of said planetary gear mechanism to select a relatively low gear ratio side speed mode among said first speed mode and said second speed mode; a friction clutch which may be coupled with said third rotational element of said planetary gear mechanism to select a relatively high gear ratio side speed mode among said first speed mode and said second speed mode; and a ratchet-type one-way clutch (50; 150) to prevent a torque drop when shifting between said first speed mode and said second speed mode, wherein engagement portions (18-2, 26-1) of said dog clutch (28; 128) and ratchet engagement portions of said ratchet-type one-way clutch (50; 150) are arranged at the same rotational phase position. a planetary gear mechanism which comprises three rotational elements (16, 18, 20; 16, 18, 120) including a carrier pivotally supporting plural pinions and including plural gears (16, 18) which have a different tooth number and engage with said pinions, and said planetary gear mechanism comprises a first speed mode in which a first rotational element (20, 120) selected from said three rotational elements (16, 18, 20; 16, 18, 120) is fixed to a housing side and power transmission is performed by using a gear ratio whose value is different from 1.0 and which is obtained between a second rotational element and a third rotational element, and a second speed mode in which said power transmission is performed by using a gear ratio whose value is 1.0 and which is obtained by said first rotational element being fixed to a housing side and by inputting rotation of the output axis of the electric motor to one of said second rotational element and said third rotational element, and outputting said rotation from said one rotational element, or by not fixing said first rotational element to said housing side and integrally rotating one of said second rotational element and said third rotational element with said first rotational element; a dog clutch (28; 128) which may be coupled with said second rotational element of said planetary gear mechanism to select a relatively low gear ratio side speed mode among said first speed mode and said second speed mode; a friction clutch which may be coupled with said third rotational element of said planetary gear mechanism to select a relatively high gear ratio side speed mode among said first speed mode and said second speed mode; and a ratchet-type one-way clutch (50; 150) to prevent a torque drop when shifting between said first speed mode and said second speed mode, wherein engagement portions (18-2, 26-1) of said dog clutch (28; 128) and ratchet engagement portions of said ratchet-type one-way clutch (50; 150) are arranged at the same rotational phase position.