disclosed is an analyzer comprising : a liquid container mounting section in which a liquid container are set ; a container mounting section in which at least one tip container accommodating a plurality of pipette tips is set ; a cover detecting section that detects a presence of a cover mounted on the tip container ; a dispensing section that equips a pipette tip accommodated in the tip container and dispenses a quantity of liquid from the liquid container to a reaction container via the equipped pipette tip ; a detecting section that interrogate a property of the liquid ; and a controller programmed to prohibit a process of equipping the pipette tip by the dispensing section when the cover on the tip container is detected , and permits the process when no cover is detected .