This invention provides an analyzer that has a liquid dispense pipette dispensing liquids with higher accuracy and precision at higher speeds. The analyzer includes a drive mechanism having a stepping motor as a power source. The drive mechanism transmits power from a rotation output shaft of the stepping motor to a moving unit for executing a target motion via at least one power transmission unit. The amount of idling of the moving unit stemming from the stepping motor getting driven in reverse is calculated from the amount of movement of the moving unit, from the amount of pulses fed to the stepping motor, and from the amount of remaining pulses so as to perform motion control of the drive mechanism accordingly.