A saddle-type vehicle, comprising an engine; an intake path connected to the engine; an air cleaner connected to the intake path; a tank provided in the air cleaner and having a hole formed therein; and a blow-by gas path having an entrance connected to the engine and an exit connected to the tank, and allowing blow-by gas containing fuel and oil to flow therein; wherein: the blow-by gas path is exposed to outside air; and the air cleaner includes: a case having the tank built therein; an air intake opening; and a connection opening connected to the intake path; and wherein: the exit is located at a lower position than that of the entrance characterized in that the air cleaner includes an element, located rearward to the tank, for partitioning the inside of the case into a first chamber and a second chamber, whereby the element purifies the air passing the element; the air intake opening is formed in the first chamber of the case for sucking air outside the air cleaner into the first chamber; the connection opening is formed in the second chamber of the case; and an inner wall of the case is provided with a projection located between the tank and the element, located at a lower position than that of the connection opening, and extending in a width direction of the saddle-type vehicle. the blow-by gas path is exposed to outside air; and the air cleaner includes: a case having the tank built therein; an air intake opening; and a connection opening connected to the intake path; and wherein: the exit is located at a lower position than that of the entrance characterized in that the air cleaner includes an element, located rearward to the tank, for partitioning the inside of the case into a first chamber and a second chamber, whereby the element purifies the air passing the element; the air intake opening is formed in the first chamber of the case for sucking air outside the air cleaner into the first chamber; the connection opening is formed in the second chamber of the case; and a case having the tank built therein; an air intake opening; and a connection opening connected to the intake path; and wherein: the exit is located at a lower position than that of the entrance characterized in that the air cleaner includes an element, located rearward to the tank, for partitioning the inside of the case into a first chamber and a second chamber, whereby the element purifies the air passing the element; the air intake opening is formed in the first chamber of the case for sucking air outside the air cleaner into the first chamber; the connection opening is formed in the second chamber of the case; and the exit is located at a lower position than that of the entrance characterized in that the air cleaner includes an element, located rearward to the tank, for partitioning the inside of the case into a first chamber and a second chamber, whereby the element purifies the air passing the element; the air intake opening is formed in the first chamber of the case for sucking air outside the air cleaner into the first chamber; the connection opening is formed in the second chamber of the case; and an inner wall of the case is provided with a projection located between the tank and the element, located at a lower position than that of the connection opening, and extending in a width direction of the saddle-type vehicle.