PURPOSE: To attempt to improve the maintainability and prolong the life of bearing by separating the inside of a magnet pump to a pump room and a magnet room, and forcibly circulating liquid inside the room to forcibly lubricate a bearing part.

CONSTITUTION: The inside of a pump case 1 is separated to a pump room Z1 and a magnet room Z2 with a housing 3 and a magnet case 2, a slave magnet ring is rotated by a motor 8 through a driving magnet ring 6, and an impeller 4 is rotationally driven by a rotary shaft penetrating a separation wall 10. At this time, liquid inside the magnet room Z2 is forcibly circulated by an auxiliary impeller 11 provided on a slave magnet ring 5 as shown by an arrow to lubricate the thrust bearing and the radial bearing respectively of a front bearing part 12 and a rear part 13, and cooled by cooling wind Q through the magnet case 2, thereby the maintainability is improved and prolongation of the life of bearing can be attempted.