Provided is a gear pump provided with pump gears which can promote both of strength and dimension precision without using a special resin material or an injection molder for preventing occurrence of shrinkage deformation. The gear pump comprises: a housing having a pump chamber making a fluid inlet communicate with a fluid outlet; a motor; and the pump gears, which are a pair of gears made of a resin and arranged within the pump chamber. The pump gears include: a driving gear rotationally driven by the motor; and a driven gear engaged with the driving gear. A part from which a portion of thickness is removed is formed between a shaft hole and teeth on an end surface of each of the pump gears in a concave manner. A rib integrated with each of the pump gears is installed in the part from which a portion of thickness is removed. A gap is formed between a side surface of the teeth side of the part from which a portion of thickness is removed and a surface of the rib facing the side surface.