A tube pump comprising:- a cap having a cylindrical inner circumferential surface; a base to which the cap is attached; a tube arranged along the inner circumferential surface; a rotor comprising:- a disk part; a roller presser member; and a support shaft extending toward the roller presser member from a central part of a surface of the disk part; at least one roller rotatably held by the rotor between the roller presser member and the disk part, the at least one roller being configured to transport content of the tube by pressing the tube with the inner circumferential surface and orbiting along the inner circumferential surface when the rotor is rotated and thereby causing a peristaltic motion of the tube; wherein the disk part holds the at least one roller on a disk part side; and a drive unit (10, 20) that rotates the rotor so that the roller makes an orbital motion along the inner circumferential surface; characterized by: a joint shaft that transmits a rotational motion of an output shaft of the drive unit to the rotor; wherein a positioning shaft part having a non-circular cross section is formed on a rotor side end portion of the joint shaft; wherein an engagement shaft part that has a non-circular cross section and that has a diameter larger than that of the positioning shaft part is formed on a drive unit side portion of the joint shaft with respect to the positioning shaft part; wherein a positioning hole (121e1) that is capable of engaging with the positioning shaft part is formed in the support shaft; and wherein an engagement hole (121e2) that is capable of engaging with the engagement shaft part is formed in the disk part. a cap having a cylindrical inner circumferential surface; a base to which the cap is attached; a tube arranged along the inner circumferential surface; a rotor comprising:- a disk part; a roller presser member; and a support shaft extending toward the roller presser member from a central part of a surface of the disk part; a disk part; a roller presser member; and a support shaft extending toward the roller presser member from a central part of a surface of the disk part; at least one roller rotatably held by the rotor between the roller presser member and the disk part, the at least one roller being configured to transport content of the tube by pressing the tube with the inner circumferential surface and orbiting along the inner circumferential surface when the rotor is rotated and thereby causing a peristaltic motion of the tube; wherein the disk part holds the at least one roller on a disk part side; and a drive unit (10, 20) that rotates the rotor so that the roller makes an orbital motion along the inner circumferential surface; characterized by: a joint shaft that transmits a rotational motion of an output shaft of the drive unit to the rotor; wherein a positioning shaft part having a non-circular cross section is formed on a rotor side end portion of the joint shaft; wherein an engagement shaft part that has a non-circular cross section and that has a diameter larger than that of the positioning shaft part is formed on a drive unit side portion of the joint shaft with respect to the positioning shaft part; wherein a positioning hole (121e1) that is capable of engaging with the positioning shaft part is formed in the support shaft; and wherein an engagement hole (121e2) that is capable of engaging with the engagement shaft part is formed in the disk part. a joint shaft that transmits a rotational motion of an output shaft of the drive unit to the rotor; wherein a positioning shaft part having a non-circular cross section is formed on a rotor side end portion of the joint shaft; wherein an engagement shaft part that has a non-circular cross section and that has a diameter larger than that of the positioning shaft part is formed on a drive unit side portion of the joint shaft with respect to the positioning shaft part; wherein a positioning hole (121e1) that is capable of engaging with the positioning shaft part is formed in the support shaft; and wherein an engagement hole (121e2) that is capable of engaging with the engagement shaft part is formed in the disk part.