A saddle-straddling type motor vehicle comprising: a head pipe; a front wheel arranged below the head pipe (1 a); a main frame that extends in a vehicle rearward downward direction from the head pipe (1 a); a pair of right and left seat frames that extends in a vehicle rearward direction from the main frame; a swing arm arranged below the pair of seat frames and mounted to the main frame to be swingable with a pivot shaft being used as a center; a rear wheel rotatably mounted to the swing arm; a front wheel brake device for braking the front wheel; a rear wheel brake device for braking the rear wheel; a seat supported by the pair of seat frames; a hydraulic unit, for driving the front wheel brake device and the rear wheel brake device, that is provided below the seat and above the swing arm; a front wheel brake pipe for connecting the front wheel brake device to the hydraulic unit; and a rear wheel brake pipe for connecting the rear wheel brake device to the hydraulic unit, wherein at least a part of the hydraulic unit is positioned between the pair of seat frames, the pivot shaft is positioned at a position obliquely further forward downward than the hydraulic unit, the front wheel brake pipe includes a first large diameter pipe (L2b), a first small diameter pipe (L2a) that communicates with the first large diameter pipe (L2b), and has a diameter smaller than the first large diameter pipe (L2b), and a first holder, at least the hydraulic unit and the first holder are coupled by the first small diameter pipe (L2a), the rear wheel brake pipe includes a second large diameter pipe (L4b), a second small diameter pipe (L4a) that communicates with the second large diameter pipe (L4b), and has a diameter smaller than the second large diameter pipe (L4b), and a second holder, at least the hydraulic unit and the second holder are coupled by the second small diameter pipe (L4a), and the first and second holders (60, 70) are fixed to one seat frame by a common fastening member between the hydraulic unit and the pivot shaft when seen in side view to sandwich a part of the one seat frame therebetween. a head pipe; a front wheel arranged below the head pipe (1 a); a main frame that extends in a vehicle rearward downward direction from the head pipe (1 a); a pair of right and left seat frames that extends in a vehicle rearward direction from the main frame; a swing arm arranged below the pair of seat frames and mounted to the main frame to be swingable with a pivot shaft being used as a center; a rear wheel rotatably mounted to the swing arm; a front wheel brake device for braking the front wheel; a rear wheel brake device for braking the rear wheel; a seat supported by the pair of seat frames; a hydraulic unit, for driving the front wheel brake device and the rear wheel brake device, that is provided below the seat and above the swing arm; a front wheel brake pipe for connecting the front wheel brake device to the hydraulic unit; and a rear wheel brake pipe for connecting the rear wheel brake device to the hydraulic unit, wherein at least a part of the hydraulic unit is positioned between the pair of seat frames, the pivot shaft is positioned at a position obliquely further forward downward than the hydraulic unit, the front wheel brake pipe includes a first large diameter pipe (L2b), a first small diameter pipe (L2a) that communicates with the first large diameter pipe (L2b), and has a diameter smaller than the first large diameter pipe (L2b), and a first holder, a first large diameter pipe (L2b), a first small diameter pipe (L2a) that communicates with the first large diameter pipe (L2b), and has a diameter smaller than the first large diameter pipe (L2b), and a first holder, at least the hydraulic unit and the first holder are coupled by the first small diameter pipe (L2a), the rear wheel brake pipe includes a second large diameter pipe (L4b), a second small diameter pipe (L4a) that communicates with the second large diameter pipe (L4b), and has a diameter smaller than the second large diameter pipe (L4b), and a second holder, a second large diameter pipe (L4b), a second small diameter pipe (L4a) that communicates with the second large diameter pipe (L4b), and has a diameter smaller than the second large diameter pipe (L4b), and a second holder, at least the hydraulic unit and the second holder are coupled by the second small diameter pipe (L4a), and the first and second holders (60, 70) are fixed to one seat frame by a common fastening member between the hydraulic unit and the pivot shaft when seen in side view to sandwich a part of the one seat frame therebetween.