A vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) comprising: three or more wheels including a pair of wheels (12L, 12R) spaced apart from each other in a width direction of the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) and one or more turn wheels constituted by at least one of another wheel and the pair of wheels, the one or more turn wheels being turnable to right and left relative to a direction of forward movement of the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g); a vehicle body coupled to the plurality of wheels (12L, 12R, 12F) and rollable in the width direction; an operation input unit to be operated to input a turning direction; and a lean mechanism (200, 200x, 200a, 200fx, 200gx) for leaning the vehicle body in the width direction, wherein the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) is configured to travel, when a vehicle velocity is within a velocity range from not less than a first velocity of at least zero to not more than a second velocity larger than the first velocity, in a mode in which the vehicle body is leaned by the lean mechanism (200, 200x, 200a, 200fx, 200gx) according to an input into the operation input unit, and a wheel angle changes following a lean of the vehicle body, the wheel angle is an angle of traveling direction of the one or more turn wheels with reference to the direction of forward movement of the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), characterised in that when the vehicle velocity is within the velocity range, a natural frequency (FQx) of the roll oscillation of the vehicle body is either within a range of smaller than a reference frequency or within a range of larger than the reference frequency, the reference frequency being a frequency at which oscillation of the wheel angle of the one or more turn wheels has phase delay of 90 degrees relative to the roll oscillation of the vehicle body in the width direction. three or more wheels including a pair of wheels (12L, 12R) spaced apart from each other in a width direction of the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) and one or more turn wheels constituted by at least one of another wheel and the pair of wheels, the one or more turn wheels being turnable to right and left relative to a direction of forward movement of the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g); a vehicle body coupled to the plurality of wheels (12L, 12R, 12F) and rollable in the width direction; an operation input unit to be operated to input a turning direction; and a lean mechanism (200, 200x, 200a, 200fx, 200gx) for leaning the vehicle body in the width direction, wherein the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) is configured to travel, when a vehicle velocity is within a velocity range from not less than a first velocity of at least zero to not more than a second velocity larger than the first velocity, in a mode in which the vehicle body is leaned by the lean mechanism (200, 200x, 200a, 200fx, 200gx) according to an input into the operation input unit, and a wheel angle changes following a lean of the vehicle body, the wheel angle is an angle of traveling direction of the one or more turn wheels with reference to the direction of forward movement of the vehicle (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), characterised in that when the vehicle velocity is within the velocity range, a natural frequency (FQx) of the roll oscillation of the vehicle body is either within a range of smaller than a reference frequency or within a range of larger than the reference frequency, the reference frequency being a frequency at which oscillation of the wheel angle of the one or more turn wheels has phase delay of 90 degrees relative to the roll oscillation of the vehicle body in the width direction.