A straddle-type vehicle comprising: a pair of right and left seat frames; a seat, supported by the pair of right and left seat frames above the pair of right and left seat frames, on which a driver is seated; a rear wheel arranged at a position further downward than the pair of right and left seat frames; a mud catcher that is located at a position further rearward than the seat and above the rear wheel, and extends rearward and downward from the pair of right and left seat frames; a tail lamp unit supported by the pair of right and left seat frames above the mud catcher; a tail cover arranged above the rear wheel and outside the seat frame and the tail lamp unit; a right expanded portion provided at a position further rightward than the tail cover in a vehicle width direction; and a left expanded portion provided at a position further leftward than the tail cover in the vehicle width direction, characterized in that the tail lamp unit has an emission surface having a measurement in a top-and-bottom direction that is larger than a measurement in the vehicle width direction at a rear end surface, the tail cover has a right side surface portion that extends in a front-and-rear direction at a position further rightward than the tail lamp unit, wherein the right expanded portion is arranged outside the right side surface portion, and a left side surface portion that extends in the front-and-rear direction at a position further leftward than the tail lamp unit, wherein the left expanded portion is arranged outside the left side surface portion, a right through hole that extends in the front-and-rear direction between the right expanded portion and the right side surface portion is formed, a left through hole that extends in the front-and-rear direction between the left expanded portion and the left side surface portion is formed, and a measurement in the vehicle width direction of the mud catcher is smaller than a measurement in the vehicle width direction from an outer end of the right expanded portion to an outer end of the left expanded portion, and larger than a measurement in the vehicle width direction from the right side surface portion to the left side surface portion. a pair of right and left seat frames; a seat, supported by the pair of right and left seat frames above the pair of right and left seat frames, on which a driver is seated; a rear wheel arranged at a position further downward than the pair of right and left seat frames; a mud catcher that is located at a position further rearward than the seat and above the rear wheel, and extends rearward and downward from the pair of right and left seat frames; a tail lamp unit supported by the pair of right and left seat frames above the mud catcher; a tail cover arranged above the rear wheel and outside the seat frame and the tail lamp unit; a right expanded portion provided at a position further rightward than the tail cover in a vehicle width direction; and a left expanded portion provided at a position further leftward than the tail cover in the vehicle width direction, characterized in that the tail lamp unit has an emission surface having a measurement in a top-and-bottom direction that is larger than a measurement in the vehicle width direction at a rear end surface, the tail cover has a right side surface portion that extends in a front-and-rear direction at a position further rightward than the tail lamp unit, wherein the right expanded portion is arranged outside the right side surface portion, and a left side surface portion that extends in the front-and-rear direction at a position further leftward than the tail lamp unit, wherein the left expanded portion is arranged outside the left side surface portion, a right through hole that extends in the front-and-rear direction between the right expanded portion and the right side surface portion is formed, a left through hole that extends in the front-and-rear direction between the left expanded portion and the left side surface portion is formed, and a measurement in the vehicle width direction of the mud catcher is smaller than a measurement in the vehicle width direction from an outer end of the right expanded portion to an outer end of the left expanded portion, and larger than a measurement in the vehicle width direction from the right side surface portion to the left side surface portion.