A pump (110, 120, 130) including a suction inlet for drawing in a liquid and a discharge outlet for discharging the liquid drawn in, wherein a suction direction and a discharge direction of the liquid are approximately perpendicular to each other, the pump (110, 120, 130) comprising: a shaft positioned downstream of the suction inlet such that a longitudinal direction of the shaft is approximately same as the suction direction; an impeller configured in a disk shape that rotates around an axis of rotation located in the shaft, the impeller having a plurality of blades formed radially in a radial direction from a center area located at a center portion of the disk shape as seen in the suction direction, the plurality of blades being positioned at a longitudinal position approximately same as a longitudinal position of the discharge outlet when a longitudinal direction is defined in terms of the longitudinal direction of the shaft, and the impeller being configured to rotate around the axis of rotation located in the shaft, thereby causing the liquid to be drawn in from the suction inlet and discharged from the discharge outlet; and a bearing (18-1, 18-2, 18-3a) that receives the shaft, the bearing (18-1, 18-2, 18-3a) having a guide portion (18-1b, 18c-2, 18c-3) positioned at the center area of the impeller and configured to guide the liquid drawn in from the suction inlet to the discharge outlet, wherein the impeller includes an upper blade plate forming an upper side of the disk shape and having, at a center portion thereof, a suction opening, the suction opening being a circular opening through which the liquid drawn in from the suction inlet is drawn in, and a lower blade plate forming a lower side of the disk shape and positioned to face the upper blade plate, the plurality of blades are formed between the upper blade plate and the lower blade plate, the bearing rotates with the impeller and includes a cylinder portion being hollow and configured to fit into the suction opening of the upper blade plate and have a side wall in close contact with an edge of the suction opening, and characterized in that the bearing includes, as the guide portion, a thick cylinder portion formed continuously with the cylinder portion and having a thick wall thicker than a wall of the cylinder portion, the thick cylinder portion having formed in the thick wall a plurality of through holes directed approximately perpendicularly to the shaft. a shaft positioned downstream of the suction inlet such that a longitudinal direction of the shaft is approximately same as the suction direction; an impeller configured in a disk shape that rotates around an axis of rotation located in the shaft, the impeller having a plurality of blades formed radially in a radial direction from a center area located at a center portion of the disk shape as seen in the suction direction, the plurality of blades being positioned at a longitudinal position approximately same as a longitudinal position of the discharge outlet when a longitudinal direction is defined in terms of the longitudinal direction of the shaft, and the impeller being configured to rotate around the axis of rotation located in the shaft, thereby causing the liquid to be drawn in from the suction inlet and discharged from the discharge outlet; and a bearing (18-1, 18-2, 18-3a) that receives the shaft, the bearing (18-1, 18-2, 18-3a) having a guide portion (18-1b, 18c-2, 18c-3) positioned at the center area of the impeller and configured to guide the liquid drawn in from the suction inlet to the discharge outlet, wherein the impeller includes an upper blade plate forming an upper side of the disk shape and having, at a center portion thereof, a suction opening, the suction opening being a circular opening through which the liquid drawn in from the suction inlet is drawn in, and a lower blade plate forming a lower side of the disk shape and positioned to face the upper blade plate, the plurality of blades are formed between the upper blade plate and the lower blade plate, the bearing rotates with the impeller and includes a cylinder portion being hollow and configured to fit into the suction opening of the upper blade plate and have a side wall in close contact with an edge of the suction opening, and characterized in that the bearing includes, as the guide portion, a thick cylinder portion formed continuously with the cylinder portion and having a thick wall thicker than a wall of the cylinder portion, the thick cylinder portion having formed in the thick wall a plurality of through holes directed approximately perpendicularly to the shaft.