An automated analyzer that automatically analyzes a sample, the analyzer comprising: a sample dispensing nozzle that is configured to dispense the sample; an electrolyte measuring part that is configured to measure an internal standard solution once or more at least before measuring a potential of the sample; and a temperature control unit disposed in a flow path of a diluent and the internal standard solution, and the temperature thereof is controlled to a constant temperature while each solution is sent, wherein the operation of measuring the internal standard solution before measuring the potential of the sample is configured to change between a case where the electrolyte measuring part continuously measures the potential of the sample without a vacant cycle and a case where the potential of the sample is not continuously measured and there is the vacant cycle, the automated analyzer characterized by further comprising: a first time chart that is configured to define an operation of the electrolyte measuring part when the potential is continuously measured without the vacant cycle; a second time chart that is configured to define an operation of the electrolyte measuring part when there is the vacant cycle; and an overall control unit configured to execute the time charts for controlling these operations, wherein a vacant interval during which the electrolyte measuring part is not configured to operate is provided at the beginning of the first time chart, and the second time chart is defined such that an operation of discharging or aspirating at least any one of the internal standard solution and a diluent for diluting the sample is performed at a timing corresponding to the vacant interval of the first time chart. a sample dispensing nozzle that is configured to dispense the sample; an electrolyte measuring part that is configured to measure an internal standard solution once or more at least before measuring a potential of the sample; and a temperature control unit disposed in a flow path of a diluent and the internal standard solution, and the temperature thereof is controlled to a constant temperature while each solution is sent, wherein the operation of measuring the internal standard solution before measuring the potential of the sample is configured to change between a case where the electrolyte measuring part continuously measures the potential of the sample without a vacant cycle and a case where the potential of the sample is not continuously measured and there is the vacant cycle, the automated analyzer characterized by further comprising: a first time chart that is configured to define an operation of the electrolyte measuring part when the potential is continuously measured without the vacant cycle; a second time chart that is configured to define an operation of the electrolyte measuring part when there is the vacant cycle; and an overall control unit configured to execute the time charts for controlling these operations, wherein a vacant interval during which the electrolyte measuring part is not configured to operate is provided at the beginning of the first time chart, and the second time chart is defined such that an operation of discharging or aspirating at least any one of the internal standard solution and a diluent for diluting the sample is performed at a timing corresponding to the vacant interval of the first time chart. a first time chart that is configured to define an operation of the electrolyte measuring part when the potential is continuously measured without the vacant cycle; a second time chart that is configured to define an operation of the electrolyte measuring part when there is the vacant cycle; and an overall control unit configured to execute the time charts for controlling these operations, wherein a vacant interval during which the electrolyte measuring part is not configured to operate is provided at the beginning of the first time chart, and the second time chart is defined such that an operation of discharging or aspirating at least any one of the internal standard solution and a diluent for diluting the sample is performed at a timing corresponding to the vacant interval of the first time chart.