A fender support structure comprising: a first rotation body that rotates in accordance with a steering of a front wheel; a second rotation body that is relatively rotatable with respect to the first rotation body and that supports a fender covering the front wheel; a holding mechanism that is accommodated in a space surrounded by the first rotation body and the second rotation body and that generates a holding force to hold a relative rotational position of the second rotation body relative to the first rotation body at a predetermined initial position; and a regulating mechanism that regulates a rotation of the second rotation body in accordance with a steering of the front wheel against the holding force when a steering angle of the front wheel becomes a predetermined value or more in a left direction and a right direction; wherein the holding mechanism includes: a torsion spring having a main body wound in a coil shape having an axis substantially parallel to a rotation shaft of the second rotation body and both ends (153b, 153c) formed so as to protrude radially from the main body; a first fixed portion fixed to the first rotation body and engageable with one of the both ends; and a second fixed portion fixed to the second rotation body and engageable with the other of the both ends; characterized in that: the both ends (153b, 153c) are formed so as to protrude radially inward from the main body. a first rotation body that rotates in accordance with a steering of a front wheel; a second rotation body that is relatively rotatable with respect to the first rotation body and that supports a fender covering the front wheel; a holding mechanism that is accommodated in a space surrounded by the first rotation body and the second rotation body and that generates a holding force to hold a relative rotational position of the second rotation body relative to the first rotation body at a predetermined initial position; and a regulating mechanism that regulates a rotation of the second rotation body in accordance with a steering of the front wheel against the holding force when a steering angle of the front wheel becomes a predetermined value or more in a left direction and a right direction; wherein the holding mechanism includes: a torsion spring having a main body wound in a coil shape having an axis substantially parallel to a rotation shaft of the second rotation body and both ends (153b, 153c) formed so as to protrude radially from the main body; a first fixed portion fixed to the first rotation body and engageable with one of the both ends; and a second fixed portion fixed to the second rotation body and engageable with the other of the both ends; characterized in that: the both ends (153b, 153c) are formed so as to protrude radially inward from the main body. a torsion spring having a main body wound in a coil shape having an axis substantially parallel to a rotation shaft of the second rotation body and both ends (153b, 153c) formed so as to protrude radially from the main body; a first fixed portion fixed to the first rotation body and engageable with one of the both ends; and a second fixed portion fixed to the second rotation body and engageable with the other of the both ends; characterized in that: the both ends (153b, 153c) are formed so as to protrude radially inward from the main body.