Internal rotor-type fluid machine

A gear pump device comprising:

• a rotary shaft;
• a inner rotor which is formed with a center hole, to which the rotary shaft is inserted, and rotates together with the rotary shaft;
• an outer rotor which is provided at an outer circumference of the inner rotor;
• a support portion which is provided on an inner peripheral surface of the inner rotor, and which supports the rotary shaft to be tiltable with respect to the inner rotor;
• and
• a pressure chamber inner wall surface which configures a pressure chamber which is a gap formed between the inner rotor and the outer rotor, by contacting an end surface of the inner rotor in an axial direction,
• wherein the inner rotor is pressed toward the rotary shaft by a high fluid pressure, based on a pressure difference in the pressure chamber between a high pressure side and a low pressure side having a lower pressure than the high pressure side, and
• wherein the support portion is deviated in a direction away from the pressure chamber inner wall surface further than a center position of the rotor in the axial direction.