Driving power transmission device

A driving power transmission device comprising:

• a fluid pressure type clutch device that transmits driving power between two shaft members;
• and
• a pump apparatus that supplies a fluid to the clutch device,
• wherein the pump apparatus includes:
• a pump that makes a pressure of sucked fluid high to discharge the fluid with a high-pressure;
• a first flow passage through which the fluid according to a pressure discharged from the pump is supplied to the clutch device during a driving of the pump;
• a second flow passage through which the fluid discharged from the pump is held during a stop of the pump and a pressing force is applied to the clutch device by the fluid to be held;
• and
• a switching valve that is switchable between a normal mode where a discharge port of the pump is made to communicate with the first flow passage and a locking mode where the discharge port of the pump is made to communicate with the second flow passage.