A saddle-type vehicle, comprising: a vehicle body frame; an internal combustion engine including a crankcase, a crankshaft located inside the crankcase, a cylinder section connected to a front portion of the crankcase and including a combustion chamber therein, a rotation shaft located inside the cylinder section and drivable by the crankshaft, and a cooling liquid path formed in the cylinder section, including an entrance and an exit, and having cooling liquid flow therethrough; the internal combustion engine being swingably supported by the vehicle body frame; a radiator including a radiator main body that causes the cooling liquid to radiate heat, a top tank located above the radiator main body, and a bottom tank located below the radiator main body; the radiator being located to the right or to the left of the crankcase; a pump attached to the cylinder section and drivable by the rotation shaft, the pump supplying the cooling liquid toward the entrance of the cooling liquid path; a first main path including a first upstream end connected to the exit of the cooling liquid path and a first downstream end (71 b) connected to the top tank of the radiator; a second main path including a second upstream end connected to the bottom tank of the radiator and a second downstream end connected to the pump; a bypass path including a third upstream end connected between the first upstream end and the first downstream end of the first main path and a third downstream end connected between the second upstream end and the second downstream end of the second main path; and a thermostat configured to permit the cooling liquid to flow in the bypass path when the cooling liquid has a temperature lower than a reference temperature, and to prevent the cooling liquid from flowing in the bypass path when the cooling liquid has a temperature equal to or higher than the reference temperature; characterized in that a top end of an inner space of the thermostat is, when the vehicle is still on a horizontal surface, located at a position lower than a top end of an inner space of the top tank and higher than a top end of an inner space of the pump, and wherein at least a portion of the thermostat is provided in the first main path. a vehicle body frame; an internal combustion engine including a crankcase, a crankshaft located inside the crankcase, a cylinder section connected to a front portion of the crankcase and including a combustion chamber therein, a rotation shaft located inside the cylinder section and drivable by the crankshaft, and a cooling liquid path formed in the cylinder section, including an entrance and an exit, and having cooling liquid flow therethrough; the internal combustion engine being swingably supported by the vehicle body frame; a radiator including a radiator main body that causes the cooling liquid to radiate heat, a top tank located above the radiator main body, and a bottom tank located below the radiator main body; the radiator being located to the right or to the left of the crankcase; a pump attached to the cylinder section and drivable by the rotation shaft, the pump supplying the cooling liquid toward the entrance of the cooling liquid path; a first main path including a first upstream end connected to the exit of the cooling liquid path and a first downstream end (71 b) connected to the top tank of the radiator; a second main path including a second upstream end connected to the bottom tank of the radiator and a second downstream end connected to the pump; a bypass path including a third upstream end connected between the first upstream end and the first downstream end of the first main path and a third downstream end connected between the second upstream end and the second downstream end of the second main path; and a thermostat configured to permit the cooling liquid to flow in the bypass path when the cooling liquid has a temperature lower than a reference temperature, and to prevent the cooling liquid from flowing in the bypass path when the cooling liquid has a temperature equal to or higher than the reference temperature; characterized in that a top end of an inner space of the thermostat is, when the vehicle is still on a horizontal surface, located at a position lower than a top end of an inner space of the top tank and higher than a top end of an inner space of the pump, and wherein at least a portion of the thermostat is provided in the first main path.