An ink jet recording apparatus includes a tube pump for generating negative pressure in a tube, the tube pump being provided with a tube disposed along an arcuate guide portion, a pressing roller for squeezing the tube, a rotary member to which the pressing roller is rotatably journalled, and a supporting member to which the rotary member is rotatably journalled. The tube, the pressing roller, the rotary member and the rotary member supporting member are assembled to thereby form a pump unit, and are separable from the guide portion in the state of the pump unit. Thereby, the incorporation of the tube becomes easy, and the erroneous incorporation of the tube in its buckled state or its twisted state can be eliminated easily.