A robot system includes a multi-jointed robot, a syringe actuator which pulls and pushes a plunger of a syringe having a needle； and a controller which controls the multi jointed robot to handle a vessel storing a liquid and the syringe and controls the syringe actuator. The controller includes a first control module which controls the multi-jointed robot such that the needle of the syringe punctures a cap of the vessel, a second control module which controls 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 after the first control module controls the multi-jointed robot, and a third control module which controls 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 after the second control module controls the syringe actuator.
