A robot system comprising: a multi-jointed robot including a gripper configured to grip a vessel and a syringe, a wrist portion configured to rotate the gripper, and a multi-jointed limb portion configured to move the wrist portion, wherein the gripper has a pair of finger portions (23a, 23b), and the gripper is configured to grip the vessel and the syringe by opening and closing the finger portions (23a, 23b); the robot system further comprising a syringe actuator configured to pull and push a plunger of the syringe having a needle; and a controller configured to control the multi-jointed robot to handle the vessel storing a liquid and the syringe and to control the syringe actuator, wherein the controller performs control of the multi-jointed robot such that the needle of the syringe punctures a cap of the vessel, after the control described in A, control of the syringe actuator such that the air in the syringe is sent into the vessel by pushing the plunger in a state where the vessel is positioned on an upper side of the syringe and a tip portion of the needle is positioned on an upper side of the liquid in the vessel, and after the control described in B, control of the syringe actuator such that the liquid in the vessel is absorbed through the needle by pulling the plunger in a state where the tip portion of the needle is positioned in the liquid in the vessel, and wherein according to information on a type of the liquid stored in the vessel, the controller causes the multi-jointed robot and the syringe actuator to perform (i) the control described in A to C, or (ii) after the control described in A is performed by the multi-jointed robot, causes the syringe actuator to perform the control described in C and causes the syringe actuator not to perform the control described in B. a multi-jointed robot including a gripper configured to grip a vessel and a syringe, a wrist portion configured to rotate the gripper, and a multi-jointed limb portion configured to move the wrist portion, wherein the gripper has a pair of finger portions (23a, 23b), and the gripper is configured to grip the vessel and the syringe by opening and closing the finger portions (23a, 23b); the robot system further comprising a syringe actuator configured to pull and push a plunger of the syringe having a needle; and a controller configured to control the multi-jointed robot to handle the vessel storing a liquid and the syringe and to control the syringe actuator, wherein the controller performs control of the multi-jointed robot such that the needle of the syringe punctures a cap of the vessel, after the control described in A, control of the syringe actuator such that the air in the syringe is sent into the vessel by pushing the plunger in a state where the vessel is positioned on an upper side of the syringe and a tip portion of the needle is positioned on an upper side of the liquid in the vessel, and after the control described in B, control of the syringe actuator such that the liquid in the vessel is absorbed through the needle by pulling the plunger in a state where the tip portion of the needle is positioned in the liquid in the vessel, and control of the multi-jointed robot such that the needle of the syringe punctures a cap of the vessel, after the control described in A, control of the syringe actuator such that the air in the syringe is sent into the vessel by pushing the plunger in a state where the vessel is positioned on an upper side of the syringe and a tip portion of the needle is positioned on an upper side of the liquid in the vessel, and after the control described in B, control of the syringe actuator such that the liquid in the vessel is absorbed through the needle by pulling the plunger in a state where the tip portion of the needle is positioned in the liquid in the vessel, and wherein according to information on a type of the liquid stored in the vessel, the controller causes the multi-jointed robot and the syringe actuator to perform (i) the control described in A to C, or (ii) after the control described in A is performed by the multi-jointed robot, causes the syringe actuator to perform the control described in C and causes the syringe actuator not to perform the control described in B.