Provided is an internal gear pump capable of suppressing a liquid discharge amount during high-speed rotation by controlling discharge pressure while achieving reduction in size, weight, cost, and soforth. The internal gear pump 1 is provided with: a trochoid 4 in which an inner rotor 3 having multiple external teeth is housed inside an outer rotor 2 having multiple internal teeth in an eccentrically rotatable manner with the external teeth and the external teeth interdigitated with each other, and a suction-side volume chamber for sucking liquid and a discharge-side volume chamber for discharging the liquid sucked into the suction-side volume chamber are formed between the inner teeth and the outer teeth; a casing on which a recessed part 8 for accommodating the trochoid 4 is formed; a cover 6 for covering the recessed part 8; and an ejection means 9 communicating with a liquid flow path formed on a bottom surface of the recessed part 8 so as to eject a portion of the liquid in a trochoid accommodation space formed by the casing and the cover 6.