Pump Device

A pump device, comprising:

• a rotor chamber and a rotor rotatably disposed in the rotor chamber;
• a pump chamber and an impeller rotatably disposed in the rotor chamber, wherein the impeller is coupled to the rotor and is configured to rotate with the rotor;
• a partition wall defining a partition between the rotor chamber and the pump chamber;
• a motor case that forms the rotor chamber together with the partition wall;
• a pump cover that forms the pump chamber together with the partition wall;
• and
• a bearing that rotatably supports a rotor shaft of the rotor with respect to the partition wall;
• wherein:
• a boss part projects from the partition wall toward the rotor chamber and supports the bearing;
• a projection part extends from a lateral section of the boss part, the projection part having an inclined surface section inclined radially inward toward a leading end side of the boss part;
• the boss part has formed therein a connection hole that extends from the rotor chamber to the pump chamber;
• and
• a rotor chamber side opening end of the connection hole opens along the inclined surface section.