A pump comprises an inlet chamber for providing a space into which external water is supplied; an outlet chamber provided to be connected with the inlet chamber, guiding the water inside the inlet chamber to the outside of the inlet chamber; an impeller provided inside the outlet chamber, moving the water; a first housing fixed to the outside of the outlet chamber; a rotor rotatably provided inside the first housing; a rotation axis provided to pass through the outlet chamber, connecting the rotor with the impeller; a magnetic formation unit provided to surround the first housing, forming a rotation magnetic field to rotate the rotor; a friction bearing provided to pass through the outlet chamber, rotatably supporting the rotation axis; and an outlet path for connecting the inside of the first housing with the outlet chamber.