A gear pump for transporting a fluid for a printing apparatus, and formed from a power unit and a pump unit, wherein the power unit comprises a motor that is a power source and an output portion that is linked to a main shaft of the motor, and the pump unit comprises: an input portion corresponding to the power unit output portion; a pump casing having a divided structure accommodating the input portion and a gear assembly; and the gear assembly, which is linked to the input portion and which is accommodated in the pump casing, wherein the gear assembly includes a driving gear, a driven gear that meshes with the driving gear, a driving gear shaft to which the driving gear is attached, a driven gear shaft to which the driven gear is attached, wherein the gear assembly further includes a bearing frame that rotatably supports the driving gear shaft and rotatably supports the driven gear shaft, the bearing frame including a frame main body, a pair of driving side bearing portions which is provided in the frame main body and which rotatably supports, using bearings the driving gear shaft at both ends thereof, and a pair of driven side bearing portions which is provided in the frame main body and which rotatably supports, using bearings the driven gear shaft at both ends thereof, characterized in that the frame main body is integrally formed by a pair of bearing support potions arranged to interpose the driving gear and driven gear, in which the driving side bearing portion and the driven side bearing portion are provided, and a pair of connecting portions which connects the pair of bearing support portions on the outside, and further wherein the bearing support portions include an elliptical flange portion, and a circular driving side convex portion and a circular driven side convex portion provided so as to project from the flange portion. an input portion corresponding to the power unit output portion; a pump casing having a divided structure accommodating the input portion and a gear assembly; and the gear assembly, which is linked to the input portion and which is accommodated in the pump casing, wherein the gear assembly includes a driving gear, a driven gear that meshes with the driving gear, a driving gear shaft to which the driving gear is attached, a driven gear shaft to which the driven gear is attached, wherein the gear assembly further includes a bearing frame that rotatably supports the driving gear shaft and rotatably supports the driven gear shaft, the bearing frame including a frame main body, a pair of driving side bearing portions which is provided in the frame main body and which rotatably supports, using bearings the driving gear shaft at both ends thereof, and a pair of driven side bearing portions which is provided in the frame main body and which rotatably supports, using bearings the driven gear shaft at both ends thereof, characterized in that the frame main body is integrally formed by a pair of bearing support potions arranged to interpose the driving gear and driven gear, in which the driving side bearing portion and the driven side bearing portion are provided, and a pair of connecting portions which connects the pair of bearing support portions on the outside, and further wherein the bearing support portions include an elliptical flange portion, and a circular driving side convex portion and a circular driven side convex portion provided so as to project from the flange portion.