A shifting device for a vehicle, the shifting device comprising: a rotary operating member including a rotary shaft that extends in a direction of a rotational axis, the rotary shaft having a columnar shape, and the rotary operating member being adapted to be rotated within a predetermined rotating angle range about the rotational axis; and a base member including a support wall having a bearing hole, a bearing surface being provided around the bearing hole, the bearing surface having a partially cylindrical shape, the rotary shaft being fitted in the bearing hole, and the bearing surface receiving an outer circumferential surface of the rotary shaft, wherein the support wall includes a pair of guide walls (40a, 40b) that are opposed to each other with an interval that is smaller than a diameter of the rotary shaft, the guide walls (40a, 40b) are provided so as to be continuous with the bearing surface, the guide walls (40a, 40b) define an elongated guide hole; a pair of flat surfaces (38a, 38b) are provided on the outer circumferential surface of the rotary shaft, an interval of the pair of flat surfaces (38a, 38b) is smaller than the interval of the pair of guide walls (40a, 40b), the pair of flat surfaces (38a, 38b) provided on the outer circumferential surface of the rotary shaft are parallel to each other; characterized in that one flat surface of the pair of flat surfaces (38a, 38b) is smaller than the other flat surface of the pair of flat surfaces (38a, 38b), wherein the pair of flat surfaces (38a, 38b) are configured such that the one flat surface as the smaller one of the pair of flat surfaces (38a, 38b) is located between a pair of circumferential end edges of the bearing surface, within the predetermined rotating angle range of the rotary operating member, a distance between the one flat surface as the smaller one of the pair of flat surfaces (38a, 38b) and the rotational axis is larger than a distance between the other flat surface as the larger one of the pair of flat surfaces (38a, 38b) and the rotational axis. a rotary operating member including a rotary shaft that extends in a direction of a rotational axis, the rotary shaft having a columnar shape, and the rotary operating member being adapted to be rotated within a predetermined rotating angle range about the rotational axis; and a base member including a support wall having a bearing hole, a bearing surface being provided around the bearing hole, the bearing surface having a partially cylindrical shape, the rotary shaft being fitted in the bearing hole, and the bearing surface receiving an outer circumferential surface of the rotary shaft, wherein the support wall includes a pair of guide walls (40a, 40b) that are opposed to each other with an interval that is smaller than a diameter of the rotary shaft, the guide walls (40a, 40b) are provided so as to be continuous with the bearing surface, the guide walls (40a, 40b) define an elongated guide hole; a pair of flat surfaces (38a, 38b) are provided on the outer circumferential surface of the rotary shaft, an interval of the pair of flat surfaces (38a, 38b) is smaller than the interval of the pair of guide walls (40a, 40b), the pair of flat surfaces (38a, 38b) provided on the outer circumferential surface of the rotary shaft are parallel to each other; characterized in that one flat surface of the pair of flat surfaces (38a, 38b) is smaller than the other flat surface of the pair of flat surfaces (38a, 38b), wherein the pair of flat surfaces (38a, 38b) are configured such that the one flat surface as the smaller one of the pair of flat surfaces (38a, 38b) is located between a pair of circumferential end edges of the bearing surface, within the predetermined rotating angle range of the rotary operating member, a distance between the one flat surface as the smaller one of the pair of flat surfaces (38a, 38b) and the rotational axis is larger than a distance between the other flat surface as the larger one of the pair of flat surfaces (38a, 38b) and the rotational axis.