A robot system (1) includes a multi-jointed robot (20), a syringe actuator (30) which pulls and pushes a plunger (17c) of a syringe (17) having a needle (17e), and a controller (100) which controls operation of the multi-jointed robot (20) to handle a vial (16) and the syringe (17) and controls operation of the syringe actuator (30). The controller (100) performs control of the multi-jointed robot (20) such that the needle (17e) of the syringe (17) punctures a cap (16c) of the vial (16), and then control of the syringe actuator (30) such that the air in the syringe (17) is sent into the vial (16) by pushing the plunger (17c) in a state where the vial (16) is positioned on the upper side of the syringe (17) and the tip portion of the needle (17e) is positioned on the upper side from the liquid in the vial (16), and then control of the syringe actuator (30) such that the liquid in the vial (16) is absorbed through the needle by pulling the plunger (17c) in a state where the tip portion of the needle (17e) is positioned in the liquid in the vial (16).
