An outboard motor configured to generate a thrust while using an internal combustion engine as a power source, the outboard motor comprising: a plurality of electric actuators (26,28); a power-source voltage detector configured to detect a power-source voltage in the outboard motor; a controller (6,61) configured or programmed to determine that a power-source voltage detected by the power-source voltage detector becomes lower than a predetermined threshold value, characterized in that the controller (6,61) is configured or programmed to include an event occurrence detector configured to determine that a voltage variation event has occurred if a power-source voltage detected by the power-source voltage detector becomes lower than the predetermined threshold value and if it is determined that the plurality of electric actuators (26,28) have been simultaneously driven, wherein the event occurrence detector is configured to determine that the voltage variation event has occurred if a time difference in driving-start timing between the plurality of electric actuators (26,28) falls within a predetermined period of time of 10 ms or less, and an event information recorder is configured to record event information including a number of occurrences of the voltage variation event. a plurality of electric actuators (26,28); a power-source voltage detector configured to detect a power-source voltage in the outboard motor; a controller (6,61) configured or programmed to determine that a power-source voltage detected by the power-source voltage detector becomes lower than a predetermined threshold value, characterized in that the controller (6,61) is configured or programmed to include an event occurrence detector configured to determine that a voltage variation event has occurred if a power-source voltage detected by the power-source voltage detector becomes lower than the predetermined threshold value and if it is determined that the plurality of electric actuators (26,28) have been simultaneously driven, wherein the event occurrence detector is configured to determine that the voltage variation event has occurred if a time difference in driving-start timing between the plurality of electric actuators (26,28) falls within a predetermined period of time of 10 ms or less, and an event information recorder is configured to record event information including a number of occurrences of the voltage variation event. the controller (6,61) is configured or programmed to include an event occurrence detector configured to determine that a voltage variation event has occurred if a power-source voltage detected by the power-source voltage detector becomes lower than the predetermined threshold value and if it is determined that the plurality of electric actuators (26,28) have been simultaneously driven, wherein the event occurrence detector is configured to determine that the voltage variation event has occurred if a time difference in driving-start timing between the plurality of electric actuators (26,28) falls within a predetermined period of time of 10 ms or less, and an event information recorder is configured to record event information including a number of occurrences of the voltage variation event.