A fixing device for fixing a tube for a medical apparatus comprising: an arm portion that extends in a long-axis direction of the arm portion; a fixation portion (60, 160) that is to fix the tube; and a rotation portion that is disposed between the arm portion and the fixation portion (60, 160) and allows the fixation portion (60, 160) to be rotated about the long-axis direction, wherein the rotation portion includes: a holding part that is capable of holding the fixation portion (60, 160); a hose receiving rotating part that is held by the holding part; a hose and rotation receiver that is disposed between the hose receiving rotating part and the arm portion, and that is rotated in synchronization with the hose receiving rotating part; a metal plate which is disposed between the hose and rotation receiver and the arm portion, which provides the hose and rotation receiver with an elastic force, and through which a through hole that passes in the long-axis direction of the arm portion is formed; a first plate-like member which is disposed between the metal plate and the hose and rotation receiver, which reduces a friction force generated when the hose and rotation receiver is rotated, and through which a through hole that passes in the long-axis direction of the arm portion is formed; a second plate-like member which is disposed between the hose and rotation receiver and the hose receiving rotating part, which reduces the friction force generated when the hose and rotation receiver is rotated, and through which a through hole that passes in the long-axis direction of the arm portion is formed, and wherein the fixation portion (60, 160) includes a placing part (62, 162) in which the tube is to be placed. an arm portion that extends in a long-axis direction of the arm portion; a fixation portion (60, 160) that is to fix the tube; and a rotation portion that is disposed between the arm portion and the fixation portion (60, 160) and allows the fixation portion (60, 160) to be rotated about the long-axis direction, wherein the rotation portion includes: a holding part that is capable of holding the fixation portion (60, 160); a hose receiving rotating part that is held by the holding part; a hose and rotation receiver that is disposed between the hose receiving rotating part and the arm portion, and that is rotated in synchronization with the hose receiving rotating part; a metal plate which is disposed between the hose and rotation receiver and the arm portion, which provides the hose and rotation receiver with an elastic force, and through which a through hole that passes in the long-axis direction of the arm portion is formed; a first plate-like member which is disposed between the metal plate and the hose and rotation receiver, which reduces a friction force generated when the hose and rotation receiver is rotated, and through which a through hole that passes in the long-axis direction of the arm portion is formed; a second plate-like member which is disposed between the hose and rotation receiver and the hose receiving rotating part, which reduces the friction force generated when the hose and rotation receiver is rotated, and through which a through hole that passes in the long-axis direction of the arm portion is formed, and a holding part that is capable of holding the fixation portion (60, 160); a hose receiving rotating part that is held by the holding part; a hose and rotation receiver that is disposed between the hose receiving rotating part and the arm portion, and that is rotated in synchronization with the hose receiving rotating part; a metal plate which is disposed between the hose and rotation receiver and the arm portion, which provides the hose and rotation receiver with an elastic force, and through which a through hole that passes in the long-axis direction of the arm portion is formed; a first plate-like member which is disposed between the metal plate and the hose and rotation receiver, which reduces a friction force generated when the hose and rotation receiver is rotated, and through which a through hole that passes in the long-axis direction of the arm portion is formed; a second plate-like member which is disposed between the hose and rotation receiver and the hose receiving rotating part, which reduces the friction force generated when the hose and rotation receiver is rotated, and through which a through hole that passes in the long-axis direction of the arm portion is formed, and wherein the fixation portion (60, 160) includes a placing part (62, 162) in which the tube is to be placed.