An automatic analysis device comprising: • an analysis unit that measures a composition of a sample; and • an operation control unit that includes: ∘ an input device for giving an operational instruction of at least an analysis start to the analysis unit, ∘ a storage device storing each parameter of the operational instruction, and ∘ a display device displaying each parameter of the operational instruction, and an analysis start screen, wherein the operation control unit configured to: - store check item setting information for a plurality of target users, respectively, said check item setting information including: ▪ a user setting check item list indicating check items which: • are to be checked before an analysis operation, • are input through the input device, and • are required to be displayed in the analysis start screen, in the storage device; - cause the display device to display a check item setting screen for setting said check item setting information, said check item setting screen including checkboxes for inputting whether or not an operator is required to check a check item which is to be checked before an analysis operation, in the analysis start screen, when an analysis start operation is performed, and - perform an analysis start operation including the steps of: ∘ selecting a user setting check item list for a target user matching the operator of the analysis device; ∘ displaying said analysis start screen including checkboxes for the check items of the selected user setting check item list; ∘ determining whether or not checking performed by the operator is input for all of the checkboxes, and - only when it is determined that checking is input for all of the checkboxes, the operation control unit causes an analysis start button to be displayed in the analysis start screen and allows the analysis operation to start. • an analysis unit that measures a composition of a sample; and • an operation control unit that includes: ∘ an input device for giving an operational instruction of at least an analysis start to the analysis unit, ∘ a storage device storing each parameter of the operational instruction, and ∘ a display device displaying each parameter of the operational instruction, and an analysis start screen, ∘ an input device for giving an operational instruction of at least an analysis start to the analysis unit, ∘ a storage device storing each parameter of the operational instruction, and ∘ a display device displaying each parameter of the operational instruction, and an analysis start screen, - store check item setting information for a plurality of target users, respectively, said check item setting information including: ▪ a user setting check item list indicating check items which: • are to be checked before an analysis operation, • are input through the input device, and • are required to be displayed in the analysis start screen, in the storage device; • are to be checked before an analysis operation, • are input through the input device, and • are required to be displayed in the analysis start screen, in the storage device; - cause the display device to display a check item setting screen for setting said check item setting information, said check item setting screen including checkboxes for inputting whether or not an operator is required to check a check item which is to be checked before an analysis operation, in the analysis start screen, when an analysis start operation is performed, and - perform an analysis start operation including the steps of: ∘ selecting a user setting check item list for a target user matching the operator of the analysis device; ∘ displaying said analysis start screen including checkboxes for the check items of the selected user setting check item list; ∘ determining whether or not checking performed by the operator is input for all of the checkboxes, and ∘ selecting a user setting check item list for a target user matching the operator of the analysis device; ∘ displaying said analysis start screen including checkboxes for the check items of the selected user setting check item list; ∘ determining whether or not checking performed by the operator is input for all of the checkboxes, - only when it is determined that checking is input for all of the checkboxes, the operation control unit causes an analysis start button to be displayed in the analysis start screen and allows the analysis operation to start.