Engine start device

The present invention relates to an engine start device which includes: a clutch switch that detects a predetermined depression operation of a clutch pedal; an engine start switch that detects a predetermined engine start operation; a controller that starts the engine of a vehicle in accordance with a depression operation of the clutch pedal and a predetermined engine start operation; a preheating necessity determination part that determines whether or not preheating of the engine is necessary when the depression operation of the clutch pedal and the predetermined engine start operation has been detected; an engine preheating part that starts preheating of the engine in the case of preheating of the engine being determined to be necessary; a depression monitoring part that monitors whether or not a depression operation of the clutch pedal has been detected during a predetermined time around a point in time at which preheating of the engine is completed; and a display part that performs a display that prompts execution of a depression of the clutch pedal while a depression operation of the clutch pedal has not been detected, wherein the controller starts the engine in the case of a depression operation of the clutch pedal being detected when a display that prompts execution of a depression of the clutch pedal is performed, and prohibits starting of the engine when a depression operation of the clutch pedal has been detected by the clutch switch after the passage of the predetermined time from the point in time when preheating of the engine is completed.