An automatic analyzer comprising: an input unit for inputting a work schedule for the user of the automatic analyzer; a planning section adapted to schedule in advance task events relating to reagent, calibration, accuracy control and maintenance, the task events being predictable to occur from parameter and reagent information registered in the automatic analyzer and measurement and maintenance records; a schedule preparing section adapted to prepare, from the task events scheduled by the planning section, a time-series task schedule representing a list of tasks to be performed by the user within a period of time allocated to him or her; a reserving section adapted to allow the user to set any scheduled performance time of day for a task event on the task schedule; and a display unit adapted to display the task schedule prepared by the schedule preparing section, characterised in that the work schedule includes a test schedule with specific times of day specified for tests, the schedule preparing section is adapted to prepare the task schedule further from the work schedule input from the input unit and prepare the task schedule as a time-series task schedule chart (308~315) representing said tasks to be performed by the user, wherein the display unit is adapted to display the time-series task schedule chart (308~315) on a screen together with a schedule area including the test schedule with the specific times of day specified for tests, and to automatically display, upon a log-in to, or a log-out from, a system by a user, the task schedule for the user for the corresponding time slot and to display a task not performed by a person previously in charge so as to be carried over to the logged-in user. an input unit for inputting a work schedule for the user of the automatic analyzer; a planning section adapted to schedule in advance task events relating to reagent, calibration, accuracy control and maintenance, the task events being predictable to occur from parameter and reagent information registered in the automatic analyzer and measurement and maintenance records; a schedule preparing section adapted to prepare, from the task events scheduled by the planning section, a time-series task schedule representing a list of tasks to be performed by the user within a period of time allocated to him or her; a reserving section adapted to allow the user to set any scheduled performance time of day for a task event on the task schedule; and a display unit adapted to display the task schedule prepared by the schedule preparing section, characterised in that the work schedule includes a test schedule with specific times of day specified for tests, the schedule preparing section is adapted to prepare the task schedule further from the work schedule input from the input unit and prepare the task schedule as a time-series task schedule chart (308~315) representing said tasks to be performed by the user, wherein the display unit is adapted to display the time-series task schedule chart (308~315) on a screen together with a schedule area including the test schedule with the specific times of day specified for tests, and to automatically display, upon a log-in to, or a log-out from, a system by a user, the task schedule for the user for the corresponding time slot and to display a task not performed by a person previously in charge so as to be carried over to the logged-in user.