A leaning vehicle comprising: a vehicle body configured to lean left thereby turning of the leaning vehicle leftward in a left-right direction of the leaning vehicle, and configured to lean right thereby turning of the leaning vehicle rightward in the left-right direction of the leaning vehicle; a left wheel disposed at the left side of a center of the vehicle body in the left-right direction of the vehicle body; a right wheel disposed at the right side of the center of the vehicle body in the left-right direction of the vehicle body, and at a right side of the left wheel; a leaning mechanism including a support arm (30L, 30R) which supports the left wheel and the right wheel in a rotatable manner about a rotation axis extending in a front-back direction of the vehicle body, the support arm (30L, 30R) being supported by the vehicle body in a rotatable manner about a rotation axis extending in a front-back direction of the vehicle body, and a leaning drive mechanism causing the vehicle body, the left wheel and the right wheel to lean; the leaning drive mechanism including a drive source configured to generate a driving force which causes the support arm (30L, 30R) to rotate with respect to the vehicle body, the leaning drive mechanism being supported by the vehicle body; and a leaning brake mechanism configured to apply a resistance to a rotation of the support arm (30L, 30R) with respect to the vehicle body, wherein the leaning drive mechanism includes a gear, a rotary shaft (37a, 41, 36) connected to the drive source and the support arm (30L, 30R) and configured to rotate in an interlocking manner with the support arm (30L, 30R), and a gear casing member accommodating at least a portion of the gear and a portion of the rotary shaft (37a, 41, 36), the leaning drive mechanism configured to transmit the driving force generated by the drive source to the support arm (30L, 30R) through the gear and the rotary shaft (37a, 41, 36), characterised in that, the leaning brake mechanism includes: a brake member which is connected to one of the gear or the rotary shaft (37a, 41, 36) and is configured to rotate in an interlocking manner with the support arm (30L, 30R) by way of the gear or the rotary shaft (37a, 41, 36) to which the brake member is connected; and a resistance applying member which is configured to apply a resistance to a motion of the brake member with respect to the vehicle body, and the gear and the rotary shaft (37a, 41, 36) of the leaning drive mechanism and the brake member of the leaning brake mechanism are rotatable with respect to the gear casing member of the leaning drive mechanism, and are supported by the vehicle body in a rotatable manner by way of the gear casing member of the leaning drive mechanism. a vehicle body configured to lean left thereby turning of the leaning vehicle leftward in a left-right direction of the leaning vehicle, and configured to lean right thereby turning of the leaning vehicle rightward in the left-right direction of the leaning vehicle; a left wheel disposed at the left side of a center of the vehicle body in the left-right direction of the vehicle body; a right wheel disposed at the right side of the center of the vehicle body in the left-right direction of the vehicle body, and at a right side of the left wheel; a leaning mechanism including a support arm (30L, 30R) which supports the left wheel and the right wheel in a rotatable manner about a rotation axis extending in a front-back direction of the vehicle body, the support arm (30L, 30R) being supported by the vehicle body in a rotatable manner about a rotation axis extending in a front-back direction of the vehicle body, and a leaning drive mechanism causing the vehicle body, the left wheel and the right wheel to lean; the leaning drive mechanism including a drive source configured to generate a driving force which causes the support arm (30L, 30R) to rotate with respect to the vehicle body, the leaning drive mechanism being supported by the vehicle body; and a leaning brake mechanism configured to apply a resistance to a rotation of the support arm (30L, 30R) with respect to the vehicle body, wherein the leaning drive mechanism includes a gear, a rotary shaft (37a, 41, 36) connected to the drive source and the support arm (30L, 30R) and configured to rotate in an interlocking manner with the support arm (30L, 30R), and a gear casing member accommodating at least a portion of the gear and a portion of the rotary shaft (37a, 41, 36), the leaning drive mechanism configured to transmit the driving force generated by the drive source to the support arm (30L, 30R) through the gear and the rotary shaft (37a, 41, 36), characterised in that, the leaning brake mechanism includes: a brake member which is connected to one of the gear or the rotary shaft (37a, 41, 36) and is configured to rotate in an interlocking manner with the support arm (30L, 30R) by way of the gear or the rotary shaft (37a, 41, 36) to which the brake member is connected; and a resistance applying member which is configured to apply a resistance to a motion of the brake member with respect to the vehicle body, and the gear and the rotary shaft (37a, 41, 36) of the leaning drive mechanism and the brake member of the leaning brake mechanism are rotatable with respect to the gear casing member of the leaning drive mechanism, and are supported by the vehicle body in a rotatable manner by way of the gear casing member of the leaning drive mechanism.