Test tube gripper for gripping a test tube, a lower end of which is inserted into a hole of a palette, separating the test tube from the palette, and feeding the test tube, the test tube gripper comprising: a base plate; a gripper body connected to the base plate; a finger fixing block being movable upwards and downwards with respect to the gripper body; an upward/downward driving unit for moving the finger fixing block upwards and downwards; and a finger coupled to the finger fixing block to be moved upwards and downwards in association with the finger fixing block such that facing gripping ends (373, 383) thereof are spaced apart from each other to accommodate the test tube inside the finger when the finger is lowered and the facing gripping ends (373, 383) thereof get closer to each other to grip the test tube accommodated inside the finger when the finger is raised, characterized in that the gripper body is rotated forwards and rearwards about the base plate against a forward/rearward reaction force of the test tube generated during an operation of gripping and separating the test tube, and the finger is rotated leftwards and rightwards about the finger fixing block against a leftward/rightward reaction force of the test tube generated during an operation of gripping and separating the test tube and the gripper body is connected to the base plate to be rotated forwards and rewards with respect to the base plate and is configured to be rotated about a rotary shaft to maintain a vertical position due to weight, and wherein the test tube gripper further comprises a first return spring connecting the gripper body and the base plate to press and rotate the gripper body forwards about the rotary shaft. a base plate; a gripper body connected to the base plate; a finger fixing block being movable upwards and downwards with respect to the gripper body; an upward/downward driving unit for moving the finger fixing block upwards and downwards; and a finger coupled to the finger fixing block to be moved upwards and downwards in association with the finger fixing block such that facing gripping ends (373, 383) thereof are spaced apart from each other to accommodate the test tube inside the finger when the finger is lowered and the facing gripping ends (373, 383) thereof get closer to each other to grip the test tube accommodated inside the finger when the finger is raised, characterized in that the gripper body is rotated forwards and rearwards about the base plate against a forward/rearward reaction force of the test tube generated during an operation of gripping and separating the test tube, and the finger is rotated leftwards and rightwards about the finger fixing block against a leftward/rightward reaction force of the test tube generated during an operation of gripping and separating the test tube and the gripper body is connected to the base plate to be rotated forwards and rewards with respect to the base plate and is configured to be rotated about a rotary shaft to maintain a vertical position due to weight, and wherein the test tube gripper further comprises a first return spring connecting the gripper body and the base plate to press and rotate the gripper body forwards about the rotary shaft.